Delete background_update table creation in main data_store

synapse/storage/data_stores/main/schema/delta/25/00background_updates.sql

@@ -1,21 +0,0 @@
-/* Copyright 2015, 2016 OpenMarket Ltd
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-
-CREATE TABLE IF NOT EXISTS background_updates(
-    update_name TEXT NOT NULL, -- The name of the background update.
-    progress_json TEXT NOT NULL, -- The current progress of the update as JSON.
-    CONSTRAINT background_updates_uniqueness UNIQUE (update_name)
-);