CSS: Add missing `:last-child` pseudo-class

Fixes #1102.

data/filedefs/filetypes.css

@@ -32,7 +32,7 @@ primary=background background-attachment background-color background-image backg
 # CSS 2 properties
 secondary=azimuth border-bottom-color border-bottom-style border-collapse border-left-color border-left-style border-right-color border-right-style border-spacing border-top-color border-top-style bottom caption-side clip content counter-increment counter-reset cue cue-after cue-before cursor direction elevation empty-cells font-size-adjust font-stretch left max-height max-width min-height min-width orphans outline outline-color outline-style outline-width overflow page-break-after page-break-before page-break-inside pause pause-after pause-before pitch pitch-range play-during position quotes richness right speak speak-header speak-numeral speak-punctuation speech-rate stress table-layout top unicode-bidi visibility voice-family volume widows z-index
 css3_properties=align-content align-items align-self alignment-adjust alignment-baseline animation animation-delay animation-direction animation-duration animation-iteration-count animation-name animation-play-state animation-timing-function appearance ascent backface-visibility background-break background-clip background-origin background-size baseline baseline-shift bbox binding bleed bookmark-label bookmark-level bookmark-state bookmark-target border-bottom-left-radius border-bottom-right-radius border-break border-image border-image-outset border-image-repeat border-image-slice border-image-source border-image-width border-length border-radius border-top-left-radius border-top-right-radius box-align box-decoration-break box-direction box-flex box-flex-group box-lines box-orient box-pack box-shadow box-sizing box-sizing break-after break-before break-inside cap-height centerline color-profile column-break-after column-break-before column-count column-fill column-gap column-rule column-rule-color column-rule-style column-rule-width column-span column-width columns crop definition-src descent dominant-baseline drop-initial-after-adjust drop-initial-after-align drop-initial-before-adjust drop-initial-before-align drop-initial-size drop-initial-value fit fit-position flex flex-align flex-basis flex-direction flex-flow flex-grow flex-shrink flex-wrap float-offset font-effect font-emphasize font-emphasize-position font-emphasize-style font-size-adjust font-smooth grid-columns grid-rows hanging-punctuation hyphenate-after hyphenate-before hyphenate-character hyphenate-lines hyphenate-resource hyphens icon image-orientation image-rendering image-resolution inline-box-align justify-content line-break line-stacking line-stacking-ruby line-stacking-shift line-stacking-strategy mark mark-after mark-before marker-offset marks marquee-direction marquee-loop marquee-play-count marquee-speed marquee-style mathline move-to nav-down nav-index nav-left nav-right nav-up opacity order outline-offset overflow-style overflow-wrap overflow-x overflow-y page page-policy panose-1 perspective perspective-origin phonemes presentation-level punctuation-trim rendering-intent resize rest rest-after rest-before rotation rotation-point ruby-align ruby-overhang ruby-position ruby-span size slope src stemh stemv string-set tab-side tab-size target target-name target-new target-position text-align-last text-decoration-color text-decoration-line text-decoration-skip text-decoration-style text-emphasis text-emphasis-color text-emphasis-position text-emphasis-style text-height text-indent text-justify text-outline text-replace text-shadow text-space-collapse text-underline-position text-wrap topline transform transform-origin transform-style transition transition-delay transition-duration transition-property transition-timing-function unicode-range units-per-em voice-balance voice-duration voice-pitch voice-pitch-range voice-rate voice-stress voice-volume white-space-collapse widths word-break word-wrap x-height
-pseudoclasses=active checked current disabled empty enabled first-child first-of-type focus hover lang last-of-type link not nth-child nth-last-child nth-last-of-type nth-of-type only-child only-of-type root target visited
+pseudoclasses=active checked current disabled empty enabled first-child first-of-type focus hover lang last-child last-of-type link not nth-child nth-last-child nth-last-of-type nth-of-type only-child only-of-type root target visited
 pseudo_elements=after before choices first-letter first-line line-marker marker outside repeat-index repeat-item selection slot value
 # use wild card with vendor prefixes for future proof, no need to list specific properties
 browser_css_properties=^-ms- ^-apple- ^-epub- ^-moz- ^-o- ^-wap- ^-webkit- ^-xv-