fix: update plugins which are detected as out of sync

This is regression introduced in 2550758.
The plugins were being detected out of sync but not actually synced to
Kong.
No tests are added currently since this is due a refactor soon.

From #138

internal/ingress/controller/kong.go

@@ -497,6 +497,7 @@ func (n *NGINXController) syncServices(ingressCfg *ingress.Configuration) (bool,
 							}
 							p.Consumer = fmt.Sprintf("%v", consumer.GetUID())
 						}
+						pluginsToUpdate = append(pluginsToUpdate, p)
 					}
 				}
 			}
@@ -908,6 +909,7 @@ func (n *NGINXController) syncRoutes(ingressCfg *ingress.Configuration) (bool, e
 							}
 							p.Consumer = fmt.Sprintf("%v", consumer.GetUID())
 						}
+						pluginsToUpdate = append(pluginsToUpdate, p)
 					}
 					glog.Infof("plugin %v configuration in kong is up to date.", pluginInk8s.PluginName)