A problem with removing StyleI.player: an obscure difference

between StyleI.player and MenuI.player is that StyleI is set even
if there's no attached MenuButton, and MenuI.player is set even
if there's no attached column.  That's an odd distinction, anyway.

Move input.MenuI.player to input.pn.  This also puts it in the
same place as input.mp.

stepmania/src/StepMania.cpp

@@ -1433,7 +1433,10 @@ void HandleInputEvents(float fDeltaTime)
 		}
 
 		if( input.GameI.IsValid() )
+		{
 			INPUTMAPPER->GameToMenu( input.GameI, input.MenuI );
+			input.pn = INPUTMAPPER->ControllerToPlayerNumber( input.GameI.controller );
+		}
 
 		if( HandleGlobalInputs(input) )
 			continue;	// skip