Do copy apps for the exchange

P2 bugfix
http://manage.dimagi.com/default.asp?151558
Reverts behanvior introduced [here](https://github.com/dimagi/commcare-hq/commit/b03a251?w=1) which was causing projects to appear on the exchange without apps.  This only happened sometimes - it appeared to be only when the apps in question were having the latest starred build published.
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