Don't wake up logical replication launcher unnecessarily

In CREATE SUBSCRIPTION, only wake up the launcher when the subscription
is enabled.

Author: Fujii Masao <masao.fujii@gmail.com>

src/backend/commands/subscriptioncmds.c

@@ -452,6 +452,7 @@ CreateSubscription(CreateSubscriptionStmt *stmt, bool isTopLevel)
 
 	heap_close(rel, RowExclusiveLock);
 
+	if (enabled)
 		ApplyLauncherWakeupAtCommit();
 
 	ObjectAddressSet(myself, SubscriptionRelationId, subid);