s3: listing may repeat on the edge

weed/s3api/s3api_objects_list_handlers.go

@@ -238,7 +238,7 @@ func (s3a *S3ApiServer) doListFilerEntries(client filer_pb.SeaweedFilerClient, d
 				return
 			}
 		}
-		if counter >= maxKeys {
+		if counter >= maxKeys + 1 {
 			isTruncated = true
 			return
 		}