R1:a039c4952f6b

Remove call to undefined method DoorkeeperDAO::getObjectKey()

Summary: Remove call to undefined static method `DoorKeeperDAO::getObjectKey()` in the `DoorkeeperExternalObject` class. `getObjectKey()` does not exist (and never existed) in any of its parent classes (`DoorkeeperDAO`, `PhabricatorLiskDAO`, `LiskDAO`).

Test Plan: Run static code analysis. Grep the source code and check the git history of parent classes.

Reviewers: O1 Blessed Committers, valerio.bozzolan

Reviewed By: O1 Blessed Committers…