fix(migration): remove extra columns

Author: fiftin

db/sql/migrations/v2.16.0.sql

@@ -1,6 +1,4 @@
 alter table `access_key` add `owner` varchar(20) default '' not null;
 alter table `access_key` add `plain` text;
 update access_key set `owner` = 'variable' where environment_id is not null and name like 'var.%';
-update access_key set `owner` = 'environment' where environment_id is not null and name like 'env.%';
-alter table `access_key` add `source_type` varchar(20) default '' not null;
-alter table `access_key` add `source_path` varchar(1000);
+update access_key set `owner` = 'environment' where environment_id is not null and name like 'env.%';