Include more packages in Owned Packages view

Summary:
If a user is a member of a project, and that project is an owner of a package,
it would make sense to display those packages in the list of owned packages.

Test Plan:
create a project that I'm a member of, then create a package that that project
owns, and reload /owners/view/owned/ and see the package listed.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D5355