Don't send email from git-cl-description

The 'notify' parameter was accidentally left out in
https://crrev.com/c/544118. The calling code in git_cl.py
already sets notify='NONE', so this will suppress all
notifications as before.

Bug: 757617
Change-Id: Ib0144d644d54b194fac0c0eb2fb51a6affa3340e
Reviewed-on: https://chromium-review.googlesource.com/634245Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Commit-Queue: Aaron Gable <agable@chromium.org>

gerrit_util.py

@@ -624,7 +624,7 @@ def SetCommitMessage(host, change, description, notify='ALL'):
   """Updates a commit message."""
   assert notify in ('ALL', 'NONE')
   path = 'changes/%s/message' % change
-  body = {'message': description}
+  body = {'message': description, 'notify': notify}
   conn = CreateHttpConn(host, path, reqtype='PUT', body=body)
   try:
     ReadHttpResponse(conn, accept_statuses=[200, 204])