GBA Video: Fix wrapped sprite mosaic clamping (fixes #1432)

CHANGES

@@ -1,4 +1,6 @@
 0.7.3: (Future)
+Emulation fixes:
+ - GBA Video: Fix wrapped sprite mosaic clamping (fixes mgba.io/i/1432)
 Other fixes:
  - Switch: Fix threading-related crash on second launch
  - Qt: Fix FPS target maxing out at 59.727 (fixes mgba.io/i/1421)

src/gba/renderers/video-software.c

@@ -834,12 +834,12 @@ static void _drawScanline(struct GBAVideoSoftwareRenderer* renderer, int y) {
 			if ((y < sprite->y && (sprite->endY - 256 < 0 || y >= sprite->endY - 256)) || y >= sprite->endY) {
 				continue;
 			}
-			if (GBAObjAttributesAIsMosaic(sprite->obj.a)) {
+			if (GBAObjAttributesAIsMosaic(sprite->obj.a) && mosaicV > 1) {
 				localY = mosaicY;
-				if (localY < sprite->y) {
+				if (localY < sprite->y && sprite->y < GBA_VIDEO_VERTICAL_PIXELS) {
 					localY = sprite->y;
 				}
-				if (localY >= sprite->endY) {
+				if (localY >= (sprite->endY & 0xFF)) {
 					localY = sprite->endY - 1;
 				}
 			}