use QApplication when qwidgets found
Created by: notmart
on desktop systems, use qapplication, which makes possible to use qwidget-based qqc2 styles. on a Plasma Desktop session, the breeze style will be used
Created by: notmart
on desktop systems, use qapplication, which makes possible to use qwidget-based qqc2 styles. on a Plasma Desktop session, the breeze style will be used