load smzip files before unmounting them so the game doesn't have to r…

…estart in order for them to actually show up, which is, stupid, really stupid

src/ScreenInstallOverlay.cpp

@@ -99,6 +99,7 @@ static void InstallSmzip( const RString &sZipFile, PlayAfterLaunchInfo &out )
 			break;
 		}
 	}
+	SONGMAN->DifferentialReloadDir(TEMP_ZIP_MOUNT_POINT);
 	FILEMAN->Unmount( "zip", sZipFile, TEMP_ZIP_MOUNT_POINT );
 
 	SCREENMAN->SystemMessage( sResult );

src/ScreenSelectMusic.cpp

@@ -416,15 +416,6 @@ void ScreenSelectMusic::Update( float fDeltaTime )
 
 bool ScreenSelectMusic::Input( const InputEventPlus &input )
 {
-	if (hasntalreadydifferentiallfartedsongs) {
-		int newsongs = SONGMAN->DifferentialReload();
-
-		if (newsongs > 0) {
-			hasntalreadydifferentiallfartedsongs = false;
-			m_MusicWheel.ReloadSongList(false, "");
-		}
-	}
-
 	// HACK: This screen eats mouse inputs if we don't check for them first.
 	bool mouse_evt = false;
 	for (int i = MOUSE_LEFT; i <= MOUSE_WHEELDOWN; i++)

src/ScreenSelectMusic.h

@@ -59,7 +59,6 @@ class ScreenSelectMusic : public ScreenWithMenuElements
 	virtual void PushSelf( lua_State *L );
 
 protected:
-	bool hasntalreadydifferentiallfartedsongs = true;
 	virtual bool GenericTweenOn() const { return true; }
 	virtual bool GenericTweenOff() const { return true; }
 	void UpdateSelectButton( PlayerNumber pn, bool bBeingPressed );