fix: Fix avoiding a log message when disconnected. (#814)

This makes the code match the comment above (and the version of the code
prior to the latest change).

Author: bgrozev

src/main/java/org/jitsi/impl/protocol/xmpp/ChatRoomImpl.java

@@ -276,7 +276,7 @@ public void leave()
                     | MultiUserChatException.MucNotJoinedException e)
             {
                 // when the connection is not connected and we get NotConnectedException, this is expected (skip log)
-                if (!(connection.isConnected() && e instanceof NotConnectedException))
+                if (connection.isConnected() || !(e instanceof NotConnectedException))
                 {
                     logger.error("Failed to properly leave " + muc, e);
                 }