Fix the blinking characters in the BeginnerHelper.

(why was this return here? we need to set up the first frame after reverting to the default animation.)
remove m_sMostRecentAnimation, as it is not needed at all.

stepmania/src/Model.h

@@ -79,7 +79,6 @@ private:
 	CString		m_sDefaultAnimation;
 	float		m_fDefaultAnimationRate;
 	float		m_fCurAnimationRate;
-	CString		m_sMostRecentAnimation;
 };