fix errors and beautify with use of class

back/mails/room/Room.ts

@@ -2,9 +2,8 @@ import { deleteRoom, getRoomNbMessageAndThread, getRoomOnMessageId } from "../..
 
 export default class Room {
     private _roomId: number;
-    constructor() {
-        this._roomId;
-    }
+
+    constructor() {}
 
     setRoomId(roomId: number): Room {
         this._roomId = roomId;