[FadingBanner] Added GetLatestIndex() Lua binding.

src/FadingBanner.cpp

@@ -252,7 +252,6 @@ void FadingBanner::LoadCourseFallback()
 	m_Banner[m_iIndexLatest].LoadCourseFallback();
 }
 
-
 // lua start
 #include "LuaBinding.h"
 
@@ -286,6 +285,7 @@ public:
 		return 0;
 	}
 	static int LoadFromSongGroup( T* p, lua_State *L )	{ p->LoadFromSongGroup( SArg(1) ); return 0; }
+	static int GetLatestIndex( T* p, lua_State *L ){ lua_pushnumber( L, p->GetLatestIndex() ); return 1; }
 
 	LunaFadingBanner()
 	{
@@ -296,6 +296,7 @@ public:
 		ADD_METHOD( LoadFromCourse );
 		ADD_METHOD( LoadIconFromCharacter );
 		ADD_METHOD( LoadCardFromCharacter );
+		ADD_METHOD( GetLatestIndex );
 	}
 };