Add the note skin pref back in, to change the default skin persistently.

Disable the EX pref; wait to add this until the screen is ready (though it
might be better to just make it a metric).

stepmania/src/PrefsManager.h

@@ -83,6 +83,9 @@ public:
 	CString			m_sSoundDrivers;
 	float			m_fSoundVolume;
 
+	/* Game-specific prefs: */
+	CString			m_sDefaultNoteSkin;
+
 	void ReadGlobalPrefsFromDisk( bool bSwitchToLastPlayedGame );
 	void SaveGlobalPrefsToDisk();