Clear out form_action_origin and http_realm when deleting logins

[bendk]

In the LoginsDb.delete() method, we clear our all sensitive fields..

Origin is considered one of the sensitive fields, I think that should mean that form_action_origin and http_realm should also be sensitive, since both could be used to identify the site the login was saved for.

┆Issue is synchronized with this Jira Task ┆Sprint End Date: 2021-10-29