Port away from KStatefulBrush::brush(const QWidget*)

Soon to be deprecated, use the QPalette overload instead.
2 jobs for master in 15 minutes and 52 seconds (queued for 148 minutes and 32 seconds)
Status Name Job ID Coverage
  Build
passed build_clazy_clang_tidy #113939

00:10:17

passed linux kf5-qt5 qt5.15 #113938

00:05:34

57.0%