Use the forget function to leave a room everywhere

Use the forget function to leave a room everywhere this is both for consistency and to reduce dependencies. This way no dependency on RoomManager is required to leave a room and since in all cases they have an object they can just call the function.

src/app/roommanager.h

@@ -195,11 +195,6 @@ public:
      */
     Q_INVOKABLE void loadInitialRoom();
 
-    /**
-     * @brief Leave the room and close it if it is open.
-     */
-    Q_INVOKABLE void leaveRoom(NeoChatRoom *room);
-
     /**
      * @brief Knock a room.
      *
@@ -208,6 +203,13 @@ public:
      */
     void knockRoom(NeoChatConnection *account, const QString &roomAliasOrId, const QString &reason, const QStringList &viaServers);
 
+    /**
+     * @brief Cleanup after the given room is left.
+     *
+     * This ensures that the current room and space are not set to the left room.
+     */
+    void roomLeft(const QString &id);
+
     /**
      * @brief Show a media item maximized.
      *