lib: fix copy srte_color from zapi_nexthop structure

When switching from nexthop to zapi_nexthop, the srte color
is copied. Do the same in reverse.

Fixes: 31f937f ("lib, zebra: Add SR-TE policy infrastructure to zebra")

Signed-off-by: Philippe Guibert <[email protected]>
(cherry picked from commit 49bc1b6)

lib/zclient.c

@@ -2171,6 +2171,7 @@ int zapi_nexthop_from_nexthop(struct zapi_nexthop *znh,
 	znh->weight = nh->weight;
 	znh->ifindex = nh->ifindex;
 	znh->gate = nh->gate;
+	znh->srte_color = nh->srte_color;
 
 	if (CHECK_FLAG(nh->flags, NEXTHOP_FLAG_ONLINK))
 		SET_FLAG(znh->flags, ZAPI_NEXTHOP_FLAG_ONLINK);