dri/nouveau: nv10: fix vertex format for GL_UNSIGNED_BYTE

Broken accidentally in f4efc256fd,
the switch to rnn headers.

NV10TCL_VTXFMT_TYPE_BYTE_RGBA became U8_UNORM but B8G8R8A8_UNORM
was used instead.

src/mesa/drivers/dri/nouveau/nv10_render.c

@@ -99,7 +99,7 @@ get_hw_format(int type)
 	case GL_UNSIGNED_SHORT:
 		return NV10_3D_VTXBUF_FMT_TYPE_V16_SNORM;
 	case GL_UNSIGNED_BYTE:
-		return NV10_3D_VTXBUF_FMT_TYPE_B8G8R8A8_UNORM;
+		return NV10_3D_VTXBUF_FMT_TYPE_U8_UNORM;
 	default:
 		assert(0);
 	}