drm/gf119/gr: fix bug in some random initval

Bug noticed vs traces.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/core/engine/graph/ctxnvd9.c

@@ -351,7 +351,7 @@ nvd9_grctx_init_rop[] = {
 	{ 0x408804,   1, 0x04, 0x00000040 },
 	{ 0x408808,   1, 0x04, 0x1043e005 },
 	{ 0x408900,   1, 0x04, 0x3080b801 },
-	{ 0x408904,   1, 0x04, 0x1043e005 },
+	{ 0x408904,   1, 0x04, 0x62000001 },
 	{ 0x408908,   1, 0x04, 0x00c8102f },
 	{ 0x408980,   1, 0x04, 0x0000011d },
 	{}