Passing of arguments to application broken

1. Create a Qt Widgets Application using the wizard.
2. Go to the active build configuration's run settings.
3. Add some arguments, e.g. "a b c", without any quotes.
4. Run the application.
5. Check the application's command line in Windows Task Manager.
   You'll see something like

   D:\Testprojekte\build-untitled23-Qt_5_2_1-Debug\debug\untitled.exe "a b c" a b c
   

   The part in quotes is wrong and should be removed.

Found by Squish test tst_qtquick_creation.