Fix: draft patch set is published by cherrypicking

If a draft patch set is cherrypicked onto the same destination
change, i.e. as a shortcut to rebasing, the newly created patch
set is not draft.

Set the draft status of the newly created patch set to the same
as the source patch set.

Change-Id: I1e6e123171ee4257a784ab79f520810975b45644
1 file changed