gossipd: remember to squelch node announcements when shuffling

Closing channels would previously require moving the node announcements
in the gossip store on occasion. They incorrectly lost their spam flag
during this process (would no longer be squelched.)

Changelog-None

gossipd/routing.c

@@ -484,7 +484,7 @@ static void force_node_announce_rexmit(struct routing_state *rstate,
 						      node->rgraph.timestamp,
 						      is_local,
 						      false,
-						      false,
+						      true,
 						      NULL);
 	}
 }