Remove unnecessary reference of patch key in save draft

Instead of looking for the patch, look for the patch set.  There may
be some value in allowing users to comment on files which are *not*
modified by the patch set, and make those comments visible to any
other viewer of the change.  Currently the UI does not support this,
and may not for some time, but its a reasonable thing to want to do
in order to facilitate a review process, and this avoids needing to
deal with the Patch entity, which I want to remove from the database.

Change-Id: Ib4eeda25cea8ff25d36f37697a4fd4525f2f6777
Signed-off-by: Shawn O. Pearce <sop@google.com>
1 file changed