[ticket/12210] dbtools::sql_create_table incorrectly throws error
related to auto-increment length on non auto-increment fields

PHPBB3-12210
Merge remote-tracking branch 'github-exreaction/ticket/12210' into develop-olympus

* github-exreaction/ticket/12210:
  [ticket/12210] dbtools::sql_create_table incorrectly throws error related to auto-increment length on non auto-increment fields