fix where jwt clusters are generated (#21606)

agent/xds/clusters.go

@@ -1003,9 +1003,9 @@ func (s *ResourceGenerator) clustersFromSnapshotAPIGateway(cfgSnap *proxycfg.Con
 
 			createdClusters[uid] = true
 		}
+	}
 
 	clusters = append(clusters, makeAPIGatewayJWKClusters(s.Logger, cfgSnap)...)
-	}
 	return clusters, nil
 }