icon: Adjust the color of the inside of the bottleneck

The (almost) black color of the inside of the bottleneck is a bit too high
contrast and doesn't fit the rest of the icon (the only black part of it).
Use the "lamp yellow" as the base and lower the L in HSL representation of
the color so it just looks as darker lamp material.

icons/scalable/geany.svg

@@ -607,7 +607,7 @@
        style="display:inline">
       <path
          sodipodi:type="arc"
-         style="color:#000000;fill:#2e3436;fill-opacity:1;fill-rule:evenodd;stroke:#c4a000;stroke-width:1.22474468px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none;stroke-dashoffset:0;marker:none;visibility:visible;display:inline;overflow:visible;enable-background:accumulate"
+         style="color:#000000;fill:#816a24;fill-opacity:1;fill-rule:evenodd;stroke:#c4a000;stroke-width:1.22474467999999992px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none;stroke-dashoffset:0;marker:none;visibility:visible;display:inline;overflow:visible;enable-background:accumulate"
          id="path17203"
          sodipodi:cx="3"
          sodipodi:cy="20.5"