Don't play the Start sound in SM_BeginFadingOut. It might

have been triggered by something that just played a sound,
or the screen might want to play a different sound.  It's
not SM_BeginFadingOut's job to play a sound.

(fixes double-start sound when "next screen" options are
selected from context menus in ScreenOptionsManage*)

stepmania/src/ScreenOptionsManageCourses.cpp

@@ -373,6 +373,7 @@ void ScreenOptionsManageCourses::ProcessMenuStart( const InputEventPlus &input )
 	}
 	else if( iCurRow == (int)m_pRows.size()-1 )	// "done"
 	{
+		SCREENMAN->PlayStartSound();
 		this->BeginFadingOut();
 	}
 	else	// a course