Skybox changes (#590)

* Update skybox_and_splitscreen.c

src/racing/skybox_and_splitscreen.c

@@ -310,12 +310,15 @@ struct Skybox {
     s16 unkA;
 };
 
-// unreferenced F3D. Perhaps goes in an unused func?
-s32 D_802B8A90[] = {
-    0xe7000000, 0x00000000, 0xb900031d, 0x0f0a4000,
-    0xba001402, 0x00300000, 0xf7000000, 0x00000000,
-    0xf64fc3bc, 0x00000000, 0xe7000000, 0x00000000,
-    0xba001402, 0x00000000, 0xb8000000, 0x00000000,
+UNUSED Gfx D_802B8A90[] = {
+    gsDPPipeSync(),
+    gsDPSetRenderMode(G_RM_OPA_SURF, G_RM_OPA_SURF2),
+    gsDPSetCycleType(G_CYC_FILL),
+    gsDPSetFillColor(0x00000000),
+    gsDPFillRectangle(0, 0, 319, 239),
+    gsDPPipeSync(),
+    gsDPSetCycleType(G_CYC_1CYCLE),
+    gsSPEndDisplayList(),
 };
 
 struct Skybox sSkyColors[] = {