GTK 3.20 doesn't seem to like it so much when looking up details of a
non-exact current style context state, so use the current one.

This is GTK being really picky as in this case we are just missing the
`DIR_LTR` flag, which we definitely don't care about, but let's make it
happy.

X-Scintilla-Bug-URL: https://sourceforge.net/p/scintilla/bugs/1825/
X-Scintilla-Commit-ID: 9fc624da4a3d935633c45fb56d0e9a77ef9b5af1