remove FinishStage from Net screens

FinishStage is handled by ScreenGameplay now.

src/ScreenNetRoom.cpp

@@ -27,8 +27,6 @@ REGISTER_SCREEN_CLASS( ScreenNetRoom );
 
 void ScreenNetRoom::Init()
 {
-	GAMESTATE->FinishStage();
-
 	ScreenNetSelectBase::Init();
 
 	m_soundChangeSel.Load( THEME->GetPathS("ScreenNetRoom","change sel") );

src/ScreenNetSelectMusic.cpp

@@ -39,9 +39,6 @@ REGISTER_SCREEN_CLASS( ScreenNetSelectMusic );
 
 void ScreenNetSelectMusic::Init()
 {
-	// Finish any previous stage. It's OK to call this when we haven't played a stage yet.
-	GAMESTATE->FinishStage();
-
 	ScreenNetSelectBase::Init();
 
 	SAMPLE_MUSIC_PREVIEW_MODE.Load( m_sName, "SampleMusicPreviewMode" );