상대방이 퇴장 했을때 sync 쪽 user list 갱신하면서 room 에 joincount 갱신하도록 수정.

projects/ucap-webmessenger-app/src/app/store/messenger/sync/reducers.ts

@@ -103,6 +103,8 @@ export const reducer = createReducer(
   }),
 
   on(clearRoomUsers, (state, action) => {
+    const roomInfo = state.room.entities[action.roomSeq];
+
     const roomUserList: RoomUserDetailData = {
       ...state.roomUser.entities[action.roomSeq]
     };
@@ -149,6 +151,15 @@ export const reducer = createReducer(
 
     return {
       ...state,
+      room: adapterRoom.upsertOne(
+        {
+          ...roomInfo,
+          joinUserCount: roomInfo.joinUserCount - action.userSeqs.length
+        },
+        {
+          ...state.room
+        }
+      ),
       roomUser: !!trgtRoomUserList
         ? adapterRoomUser.upsertOne(trgtRoomUserList, {
             ...state.roomUser