Remove ProjectProfile->loadProfileImageURI()
Summary: Ref T603. Gets rid of a sketchy, non-policy-aware, unbatched file query.
Test Plan: Looked at projects, typeahead, edited project profile images.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T603
Differential Revision: https://secure.phabricator.com/D7253