Remove getApplicationObjectTypeName from ApplicationTransactions

Summary:
We can get this out of PHIDType reasonably in all cases and simplify implementation here.

None of these translate correctly anyway so they're basically debugging/development strings.

Test Plan: grep, browsed some transactions

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D6786