LmmsPalette: retrieve palette properties via polishing

Fix the short palette widget popup which is annoying and not neccessary
as polishing does the same job without flicker.

src/core/main.cpp

@@ -399,8 +399,6 @@ int main( int argc, char * * argv )
 		QApplication::setStyle( lmmsstyle );
 		
 		LmmsPalette * lmmspal = new LmmsPalette( NULL, lmmsstyle );
-		lmmspal->show();	// necessary to get properties
-		lmmspal->hide();		
 		QPalette lpal = lmmspal->palette();
 
 		QApplication::setPalette( lpal );

src/gui/LmmsPalette.cpp

@@ -49,6 +49,7 @@ LmmsPalette::LmmsPalette( QWidget * parent, QStyle * stylearg ) :
 {
 	setStyle( stylearg );
 	stylearg->polish( this );
+	ensurePolished();
 }
 
 LmmsPalette::~LmmsPalette()