[ticket/13121] Remove cache mode from style management module

https://tracker.phpbb.com/browse/PHPBB3-13121

PHPBB3-13121
[ticket/13121] Fix migration file

PHPBB3-13121
Merge pull request #3013 from VSEphpbb/ticket/13121

[ticket/13121] Remove cache mode from style management module
Merge branch 'develop-ascraeus' into develop