Add moderation_log to drop tables script

Otherwise the entire test suite fails

Author: MonkeyDo

admin/sql/drop_tables.sql

@@ -6,6 +6,7 @@ DROP TABLE IF EXISTS oauth_grant        CASCADE;
 DROP TABLE IF EXISTS oauth_token        CASCADE;
 DROP TABLE IF EXISTS oauth_client       CASCADE;
 DROP TABLE IF EXISTS access_log         CASCADE;
+DROP TABLE IF EXISTS moderation_log     CASCADE;
 DROP TABLE IF EXISTS token_log          CASCADE;
 DROP TABLE IF EXISTS token              CASCADE;
 DROP TABLE IF EXISTS supporter          CASCADE;