Remove comcast.net from high trust sender domains

Removed 'comcast.net' from the list of high trust sender root domains.

Author: JFarina5

high_trust_sender_root_domains.txt

@@ -111,7 +111,6 @@ cloudlabs.ai
 cloudlabsai.net
 codeguard.com
 coinbase.com
-comcast.net
 concur.com
 concursolutions.com
 coned.com