Close database after migration

This is not 100% reliable as database connections are closed in a separate
thread according to the documentation:
- https://developer.mozilla.org/en-US/docs/Web/API/IDBDatabase/close
- https://stackoverflow.com/a/18639298
- 80c7a06d5c/backbone-indexeddb.js (L558-L565)

js/modules/migrations/migrations_1_database_without_attachment_data.js

@@ -11,5 +11,5 @@ exports.migrations = [
   },
 ];
 
-exports.run = ({ Backbone, Database } = {}) =>
-  runMigrations({ Backbone, database: Database });
+exports.run = ({ Backbone, closeDatabase, Database } = {}) =>
+  runMigrations({ Backbone, closeDatabase, database: Database });