broadband-modem-mbim: reset enable flags if enabling them failed

This is not extremely important, because we don't really flag as
disabled those indications that failed to be enabled (as usually we
attempt to enable them in a group, not one by one), but in this case
this will allow us to keep a clean state after a failed SIM hot swap
setup.

src/mm-broadband-modem-mbim.c

@@ -5717,6 +5717,8 @@ enable_subscriber_info_unsolicited_events_ready (MMBroadbandModemMbim *self,
         /* reset setup flags if enabling failed */
         self->priv->setup_flags &= ~PROCESS_NOTIFICATION_FLAG_SUBSCRIBER_INFO;
         common_setup_cleanup_unsolicited_events_sync (self, ctx->device, FALSE);
+        /* and also reset enable flags */
+        self->priv->enable_flags &= ~PROCESS_NOTIFICATION_FLAG_SUBSCRIBER_INFO;
     }
 
 #if defined WITH_QMI && QMI_MBIM_QMUX_SUPPORTED