[ticket/12330] Fix create index in db tools on mssql

PHPBB3-12330
Merge remote-tracking branch 'Elsensee/ticket/12330' into develop-ascraeus

* Elsensee/ticket/12330:
  [ticket/12330] Fix create index in db tools on mssql
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12330] Fix create index in db tools on mssql