fix: fix always update EMQX config

Signed-off-by: Rory Z <[email protected]>

controllers/apps/v2beta1/sync_emqx_config.go

@@ -91,7 +91,7 @@ func (s *syncConfig) reconcile(ctx context.Context, logger logr.Logger, instance
 			return subResult{err: emperror.Wrap(err, "failed to update configMap")}
 		}
 
-		instance.Annotations[appsv2beta1.AnnotationsLastEMQXConfigKey] = confStr
+		instance.Annotations[appsv2beta1.AnnotationsLastEMQXConfigKey] = instance.Spec.Config.Data
 		if err := s.Client.Update(ctx, instance); err != nil {
 			return subResult{err: emperror.Wrap(err, "failed to update emqx instance annotation")}
 		}