git cl comment: cleanup mistakenly left TODO.

R=sergiyb@chromium.org

Change-Id: Ieea94428c7d9932242fb57b80afc1cf366b7bb54
Reviewed-on: https://chromium-review.googlesource.com/472827Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>

git_cl.py

@@ -4344,9 +4344,7 @@ def CMDcomments(parser, args):
       parser.error('--gerrit or --rietveld is required if --issue is specified')
 
   cl = Changelist(issue=issue,
-                  # TODO(tandrii): remove 'rietveld' default.
-                  codereview=options.forced_codereview or (
-                      'rietveld' if issue else None),
+                  codereview=options.forced_codereview,
                   auth_config=auth_config)
 
   if options.comment: