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

Soon to be deprecated, use the QPalette overload instead.
2 jobs for master in 6 minutes and 45 seconds (queued for 58 minutes and 37 seconds)
Status Name Job ID Coverage
  Build
passed build_clazy_clang_tidy #113929

00:03:56

passed linux kf5-qt5 qt5.15 #113928

00:02:48

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