Replace QWidget->show() with QWindow()->show()
efe4aa0d replaces many calls to QWidget->show() with QWindow()->show(). Since mixing these is not supported (https://bugreports.qt.io/browse/QTBUG-120316), replace the remaining QWidget->show() with QWindow()->show() as well.
Test-plan:
- Enable KTorrent's system tray icon
- Close the main KTorrent window
- Execute ktorrent from the command line
- Close the main KTorrent window
- Execute ktorrent from the command line
Previously:
- After a few repeats ktorrent window doesn't show
Now:
- ktorrent window always shows after executing ktorrent