qt: Delete the settings after the MainInputManager
qt: Delete the settings after the MainInputManager

The input_manager may want to update the RecentMRLs upon destruction,
and needs a valid settings instance to do so

xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc