drm/gk104/gr: minor adjustment to some random initval

Change from traces of a newer binary driver version.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/core/engine/graph/ctxnve4.c

@@ -782,7 +782,7 @@ nve4_grctx_init_tpc[] = {
 	{ 0x419f58,   1, 0x04, 0x00000000 },
 	{ 0x419f70,   1, 0x04, 0x00000000 },
 	{ 0x419f78,   1, 0x04, 0x0000000b },
-	{ 0x419f7c,   1, 0x04, 0x0000027a },
+	{ 0x419f7c,   1, 0x04, 0x0000027c },
 	{}
 };