Fix bug where Slack service channel was not saved in admin template settings
Consolidate allowed parameters in one place to avoid these kinds of bugs in the future.
Closes https://github.com/gitlabhq/gitlabhq/issues/9181 Closes #1501 (closed)
Consolidate allowed parameters in one place to avoid these kinds of bugs in the future.
Closes https://github.com/gitlabhq/gitlabhq/issues/9181 Closes #1501 (closed)