git cl set-commit: fix for Rietveld if cq dry run is active.

git_cl.py

Index: git_cl.py
diff --git a/git_cl.py b/git_cl.py
index 6a59cda52b9aa21facb9041e22bd9b86135569a7..1e2261c131943f0320a35196257102011ceadfda 100755
--- a/git_cl.py
+++ b/git_cl.py
@@ -1799,7 +1799,7 @@ class _RietveldChangelistImpl(_ChangelistCodereviewBase):
       DieWithError('Cannot set-commit on private issue')
 
     if new_state == _CQState.COMMIT:
-      self.SetFlag('commit', '1')
+      self.SetFlags({'commit': '1', 'cq_dry_run': '0'})
     elif new_state == _CQState.NONE:
       self.SetFlags({'commit': '0', 'cq_dry_run': '0'})
     else: