don't forget to mark luop as a packet switched connection

In rx_upd_loc_req() we set the connection's supports_ps field but
forgot to also set the equivalent field in the corresponding luop.

Change-Id: Ie175a067ac1324cdd39d7f756a40fab923421793
Related: OS#2785
diff --git a/src/hlr.c b/src/hlr.c
index 479b5cf..195e5d2 100644
--- a/src/hlr.c
+++ b/src/hlr.c
@@ -262,6 +262,7 @@
 		 * 11.6.15 "CN Domain" says "if no CN Domain IE is present within
 		 * a request, the PS Domain is assumed." */
 		conn->supports_ps = true;
+		luop->is_ps = true;
 	}
 	llist_add(&luop->list, &g_lu_ops);