sh mainloop도 waitgroup에 추가

wshandler/wshandler.go

@@ -243,6 +243,7 @@ func (ws *WebsocketHandler) Start(ctx context.Context) {
 			sh.callReceiver = &chainReceiver{chain: sh.receiverChain}
 		}
 
+		sh.connWaitGroup.Add(1)
 		go sh.mainLoop(ctx)
 	}
 }
@@ -312,6 +313,7 @@ func (ws *WebsocketHandler) LeaveRoom(region string, room string, accid primitiv
 
 func (sh *subhandler) mainLoop(ctx context.Context) {
 	defer func() {
+		sh.connWaitGroup.Done()
 		s := recover()
 		if s != nil {
 			logger.Error(s)