When tabBarUseUserStyleSheet() is false, don't set a stylesheet at all

Merged Ahmad Samir requested to merge work/ahmad/stylesheet into master

Reading the upstream code, it looks like setStyleSheet(QString())[1] will unset any custom style sheet. This seems like a cleaner solution because setting a stylesheet at all interferes with changing the widget colorscheme from a dark to a light scheme or vice versa.

To test:

  • open konsole
  • open systemsettings and change the colorscheme to a dark one, if you're already using a dark one, change to a light one
  • widget colors are changed as expected, except for konsole tabs, which look odd

Opening a new konsole window seems to clear the issue and the tabs look normal again.

[1] https://code.woboq.org/qt5/qtbase/src/widgets/kernel/qwidget.cpp.html#_ZN7QWidget13setStyleSheetERK7QString

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