Silverblue still has an old version of g-t-e where this theming
stuff worked differently, so put that stuff back for Silverblue
but keep the new stuff for RPMs.
Signed-off-by: Adam Williamson <awilliam@redhat.com>
The latest version of Gnome-Text-Editor bring a little
bit different UI and some new or modified features.
This commit fixes the suite to run on newest version.
