[566252] Fix properties label appearance

It seems that the style used by the platform to render disabled labels
has changed since
https://git.eclipse.org/r/c/eef/org.eclipse.eef/+/70615 was merged.
Tweak the label's configuration to recover the same appearance and
behavior as before.

Bug: https://bugs.eclipse.org/bugs/show_bug.cgi?id=566252
Change-Id: I96a7ae3e4d77c9f88271135f82931169b3814cee
Signed-off-by: Pierre-Charles David <pierre-charles.david@obeo.fr>
1 file changed