Remove calls to old QApplication functions

We do the right thing automatically these days

t14/main.cpp

@@ -11,12 +11,10 @@
 
 int main( int argc, char **argv )
 {
-    QApplication::setColorMode( QApplication::CustomColors );
     QApplication a( argc, argv );
 
     GameBoard gb;
     gb.setGeometry( 100, 100, 500, 355 );
-    a.setMainWidget( &gb );
     gb.show();
     return a.exec();
 }