Sprite cache: Allow caching only required subset of sprite zoom levels

Enable for blitters based on 32bpp_optimized or SSE

src/blitter/32bpp_sse2.hpp

@@ -70,6 +70,11 @@ public:
 /** The SSE2 32 bpp blitter (without palette animation). */
 class Blitter_32bppSSE2 : public Blitter_32bppSimple, public Blitter_32bppSSE_Base {
 public:
+	Blitter_32bppSSE2()
+	{
+		this->SetSupportsMissingZoomLevels(true);
+	}
+
 	void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom) override;
 	template <BlitterMode mode, Blitter_32bppSSE_Base::ReadMode read_mode, Blitter_32bppSSE_Base::BlockType bt_last, bool translucent>
 	void Draw(const Blitter::BlitterParams *bp, ZoomLevel zoom);