Remove picture crop transaction from Conpherence

Summary: Fixes T11730. Removes an old transaction that hasn't been used in a year.

Test Plan: Run sql, check various rooms.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T11730

Differential Revision: https://secure.phabricator.com/D17666