Allow deleting of site policy

[QazCetelic]

I would like to remove a policy from the list, however I can't find how to do this.

I think it would be useful to have the option to remove a single policy or add a delete icon next to an entry if a feature like that already exists.

[hackademix]

Turning it to "DEFAULT" is exactly the same as deleting the policy: no site data, indeed, is store for DEFAULT entries, and as soon as you reload the per-site permissions page you'll see they're actually gone.,