Use defines/enums in window.c, window_8bpp.c

include/bg.h

@@ -34,7 +34,7 @@ enum
     BG_ATTR_MOSAIC = 5,
     BG_ATTR_WRAPAROUND = 6,
     BG_ATTR_PRIORITY = 7,
-    BG_ATTR_TEXTORAFFINEMODE = 8,
+    BG_ATTR_MAPSIZE = 8,
     BG_ATTR_BGTYPE = 9,
     BG_ATTR_BASETILE = 10
 };