Some respect for OOP. (MasterPlayerNumber)

src/ScreenInstallOverlay.cpp

@@ -375,7 +375,7 @@ void ScreenInstallOverlay::Update( float fDeltaTime )
 			GAMEMAN->GetStylesForGame( GAMESTATE->m_pCurGame, vpStyle, false );
 			GAMESTATE->m_PlayMode.Set( PLAY_MODE_REGULAR );
 			GAMESTATE->m_bSideIsJoined[0] = true;
-			GAMESTATE->m_MasterPlayerNumber = PLAYER_1;
+			GAMESTATE->SetMasterPlayerNumber(PLAYER_1);
 			GAMESTATE->m_pCurStyle.Set( vpStyle[0] );
 			GAMESTATE->m_pCurSong.Set( pSong );
 			GAMESTATE->m_pPreferredSong = pSong;