gtk4: Clean out trailing spaces
Before final switch to gtk-3.98, and before master and S3_1 (first branch where gui-gtk-4.0 exist) diverge, it's a good time to clean out trailing spaces from gui-gtk-4.0 code.
Before final switch to gtk-3.98, and before master and S3_1 (first branch where gui-gtk-4.0 exist) diverge, it's a good time to clean out trailing spaces from gui-gtk-4.0 code.