GlobalShortcut.cpp: replace deprecated QColor::dark() with QColor::darker()
GlobalShortcut.cpp: replace deprecated QColor::dark() with QColor::darker()

https://github.com/qt/qtbase/commit/aece0a13569737bbcced0e73c0e0b12863e2cf1f

Lartza/mumble,Lartza/mumble,Lartza/mumble,Lartza/mumble,Lartza/mumble,Lartza/mumble,Lartza/mumble,Lartza/mumble