more easily themable sort text

(Not sure whether to use the choice name or the GameCommand m_sName.
The GameCommand name is used to identify asset names.  However, we
already have a Choice name here, and it's weird having two names: the
GC name just seems like a confusing extra layer of indirection.  Hmm ...)

stepmania/src/MusicWheel.cpp

@@ -23,6 +23,7 @@
 #include "PlayerState.h"
 
 #define NUM_WHEEL_ITEMS		((int)ceil(NUM_WHEEL_ITEMS_TO_DRAW+2))
+#define WHEEL_TEXT(s)             THEME->GetMetric( "MusicWheel", ssprintf("%sText",s.c_str()) );
 
 static CString SECTION_COLORS_NAME( size_t i )	{ return ssprintf("SectionColor%d",int(i+1)); }
 static CString CHOICE_NAME( CString s )			{ return ssprintf("Choice%s",s.c_str()); }
@@ -420,7 +421,7 @@ void MusicWheel::BuildWheelItemDatas( vector<WheelItemData> &arrayWheelItemDatas
 			{
 				WheelItemData wid( TYPE_SORT, NULL, "", NULL, SORT_MENU_COLOR );
 				wid.m_Action.Load( i, ParseCommands(CHOICE.GetValue(vsNames[i])) );
-				wid.m_sLabel = wid.m_Action.m_sName;
+				wid.m_sLabel = WHEEL_TEXT(vsNames[i]);
 
 				switch( so )
 				{