slapos_mysql_innodb_catalog: keep consistency primary key simple

No need for a multi column primary key, as only one line is used per object.
This will speed up update of the table.

master/bt5/slapos_mysql_innodb_catalog/CatalogMethodTemplateItem/portal_catalog/erp5_mysql_innodb/z_create_consistency.sql

 CREATE TABLE `consistency` (
   `uid` BIGINT UNSIGNED NOT NULL,
   `consistency_error` BOOL DEFAULT 0,
-  PRIMARY KEY (`uid`, `consistency_error`)
+  PRIMARY KEY (`uid`),
+  KEY `consistency_error` (`consistency_error`)
 ) ENGINE=InnoDB;