Revert some last_call_announcement changes, as they have caused breakage.

 - Legacy-Id: 5717

Author: levkowetz

ietf/templates/idrfc/last_call_announcement.txt

@@ -1,7 +1,7 @@
-{% load ietf_filters %}{% load mail_filters %}{% autoescape off %}From: The IESG <noreply@ietf.org>
-To: IETF-Announce <ietf-announce@ietf.org> {% if cc %}
+{% load ietf_filters %}{% load mail_filters %}{% autoescape off %}From: The IESG <iesg-secretary@ietf.org>
+To: IETF-Announce <ietf-announce@ietf.org>{% if cc %}
 CC: {{ cc }}{% endif %}
-Reply-To: IETF Discussion List <ietf@ietf.org>
+Reply-To: ietf@ietf.org
 Sender: <iesg-secretary@ietf.org>
 Subject: Last Call: {{ doc.file_tag }} ({{ doc.title|clean_whitespace }}) to {{ doc|std_level_prompt }}