Revert "Allow blocking invites from people you don't share a room with"

This reverts commit ef5585d312. This was
supposed to be in an MR.

src/neochatconnection.h

@@ -79,11 +79,6 @@ class NeoChatConnection : public Quotient::Connection
      */
     Q_PROPERTY(bool isOnline READ isOnline WRITE setIsOnline NOTIFY isOnlineChanged)
 
-    /**
-     * @brief Whether the server supports querying a user's mutual rooms.
-     */
-    Q_PROPERTY(bool canCheckMutualRooms READ canCheckMutualRooms NOTIFY canCheckMutualRoomsChanged)
-
 public:
     /**
      * @brief Defines the status after an attempt to change the password on an account.
@@ -100,7 +95,6 @@ public:
 
     Q_INVOKABLE void logout(bool serverSideLogout);
     Q_INVOKABLE QVariantList getSupportedRoomVersions() const;
-    bool canCheckMutualRooms() const;
 
     /**
      * @brief Change the password for an account.
@@ -202,7 +196,6 @@ Q_SIGNALS:
     void passwordStatus(NeoChatConnection::PasswordStatus status);
     void userConsentRequired(QUrl url);
     void badgeNotificationCountChanged(NeoChatConnection *connection, int count);
-    void canCheckMutualRoomsChanged();
 
 private:
     bool m_isOnline = true;
@@ -215,6 +208,4 @@ private:
     int m_badgeNotificationCount = 0;
 
     QHash<QUrl, LinkPreviewer *> m_linkPreviewers;
-
-    bool m_canCheckMutualRooms = false;
 };