Fix git cl set-commit --clear.

  aka sergiyb@ was right.

R=sergiyb@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2141283002
diff --git a/git_cl.py b/git_cl.py
index 07f7c8b..6641566 100755
--- a/git_cl.py
+++ b/git_cl.py
@@ -4742,7 +4742,7 @@
 
   cl = Changelist(auth_config=auth_config)
   if options.clear:
-    state = _CQState.CLEAR
+    state = _CQState.NONE
   elif options.dry_run:
     state = _CQState.DRY_RUN
   else: