[RN] Fix handling XMPP connection failures

After the connection is established, it can either be properly disconnected or
fail. We need to make sure to be listening for events for either.

react/features/base/connection/actions.native.js

          * @returns {void}
          */
         function _onConnectionDisconnected(message: string) {
-            connection.removeEventListener(
-                JitsiConnectionEvents.CONNECTION_DISCONNECTED,
-                _onConnectionDisconnected);
-
+            unsubscribe();
             dispatch(_connectionDisconnected(connection, message));
         }
 
          * @returns {void}
          */
         function _onConnectionEstablished() {
-            unsubscribe();
+            connection.removeEventListener(
+                JitsiConnectionEvents.CONNECTION_ESTABLISHED,
+                _onConnectionEstablished);
             dispatch(connectionEstablished(connection));
         }
 
         function _onConnectionFailed(
                 err: string, msg: string, credentials: Object) {
             unsubscribe();
-            console.error('CONNECTION FAILED:', err, msg);
             dispatch(
                 connectionFailed(
                     connection, {
         }
 
         /**
-         * Unsubscribes connection instance from {@code CONNECTION_ESTABLISHED}
-         * and {@code CONNECTION_FAILED} events.
+         * Unsubscribe the connection instance from
+         * {@code CONNECTION_DISCONNECTED} and {@code CONNECTION_FAILED} events.
          *
          * @returns {void}
          */
         function unsubscribe() {
             connection.removeEventListener(
-                JitsiConnectionEvents.CONNECTION_ESTABLISHED,
-                _onConnectionEstablished);
+                JitsiConnectionEvents.CONNECTION_DISCONNECTED,
+                _onConnectionDisconnected);
             connection.removeEventListener(
                 JitsiConnectionEvents.CONNECTION_FAILED,
                 _onConnectionFailed);