GBA Video: Force align 256-color tiles

CHANGES

@@ -17,6 +17,7 @@ Bugfixes:
  - GB Serialize: Fix game title check
  - GB: Revamp IRQ handling based on new information
  - GBA Video: Don't mask out high bits of BLDY (fixes mgba.io/i/899)
+ - GBA Video: Force align 256-color tiles
 Misc:
  - GBA Timer: Use global cycles for timers
  - GBA: Extend oddly-sized ROMs to full address space (fixes mgba.io/i/722)

src/gba/renderers/software-obj.c

@@ -148,7 +148,7 @@ int GBAVideoSoftwareRendererPreprocessSprite(struct GBAVideoSoftwareRenderer* re
 	int32_t x = (uint32_t) GBAObjAttributesBGetX(sprite->b) << 23;
 	x >>= 23;
 	uint16_t* vramBase = &renderer->d.vram[BASE_TILE >> 1];
-	unsigned charBase = GBAObjAttributesCGetTile(sprite->c) * 0x20;
+	unsigned charBase = (GBAObjAttributesCGetTile(sprite->c) & ~GBAObjAttributesAGet256Color(sprite->a)) * 0x20;
 	if (GBARegisterDISPCNTGetMode(renderer->dispcnt) >= 3 && GBAObjAttributesCGetTile(sprite->c) < 512) {
 		return 0;
 	}