Display option to enable disable account activation, blocking, and cancellation

Reworked the form alter code to only hide the subject and body fields in each tab on the Account Settings form.

Tested on a local site with easy email overrides enabled. Targeting just subject and body did the trick. The toggle for the three email actions that can be controlled from /admin/config/people/accounts has been restored while the templates themselves still show the override link.

Thanks for testing. Merged the changes.

Automatically closed - issue fixed for 2 weeks with no activity.