Fix #1792 by giving senders a copy of emails sent by the gallery.

Fixes #1792

Originally contributed by @zippy1981

Test Notes:
* When "Contact Owners" is used, the sender receives a copy of the email that DOES NOT DISCLOSE THE OWNER NAMES AND ADDRESSES
* Report Abuse AND Contact Support messages CC their senders
* Report Abuse AND Contact Support messages DO NOT include a listing of owners and their email addresses