QML standalone application wizard should implicitly set Qt::WA_NoSystemBackground for fullscreen QML apps

By default every Qt application on Symbian reserves a large chunk of heap for a themed background graphic. So far most QML examples or demos don't use the system background, but use QDeclarativeView to show their own graphics in full screen. To save heap usage, the wizard could set flag Qt::WA_NoSystemBackground for QML applications to tell QtGui not reserve backgrounds in the memory.