use signalModifiedKey to set the key as dirty in the context of WATCH for both MIGRATE and RESTORE.

src/cluster.c

@@ -1506,6 +1506,7 @@ void restoreCommand(redisClient *c) {
     /* Create the key and set the TTL if any */
     dbAdd(c->db,c->argv[1],obj);
     if (ttl) setExpire(c->db,c->argv[1],time(NULL)+ttl);
+    signalModifiedKey(c->db,c->argv[1]);
     addReply(c,shared.ok);
     server.dirty++;
 }
@@ -1598,6 +1599,7 @@ void migrateCommand(redisClient *c) {
             robj *aux;
 
             dbDelete(c->db,c->argv[3]);
+            signalModifiedKey(c->db,c->argv[3]);
             addReply(c,shared.ok);
             server.dirty++;