Remove: ZOOM_LVL_COUNT

This is the only enumeration with a COUNT and END. The logic of the COUNT
implied that BEGIN could be non-zero, but all but two uses of zoom level
assume that BEGIN is zero, making the separate count only confusing.

src/blitter/32bpp_sse2.hpp

@@ -72,7 +72,7 @@ public:
 	};
 	struct SpriteData {
 		SpriteFlags flags;
-		SpriteInfo infos[ZOOM_LVL_COUNT];
+		SpriteInfo infos[ZOOM_LVL_END];
 		byte data[]; ///< Data, all zoomlevels.
 	};