Fix destroy not deleting fx trigger file

[tylerhunt]

What is the purpose of this pull request?

Fix an issue where running rails d logidze:model doesn’t remove the fx trigger file since it was incrementing the trigger version and attempting the next version instead of the current version.

What changes did you make? (overview)

Updated the #next_version method to return the current version when the task behavior is :revoke.

Checklist

• I've added tests for this change
• I've added a Changelog entry
• I've updated a documentation (Readme)

[palkan]

Thanks!