Enable transactions again to fix web

lib/src/database/database.dart

@@ -22,13 +22,6 @@ class Database extends _$Database {
 
   int get maxFileSize => 1 * 1024 * 1024;
 
-  // moor transactions are sometimes rather weird and freeze. Until there is a
-  // proper fix in moor we override that there aren't actually using transactions
-  @override
-  Future<T> transaction<T>(Future<T> Function() action) async {
-    return action();
-  }
-
   @override
   MigrationStrategy get migration => MigrationStrategy(
         onCreate: (Migrator m) {