Fix Alamanc service paging

Summary: Ref T8686. This method has the wrong name and calls a nonexistent method on $service.

Test Plan: Set page size to 5, paged locally, hit error, applied changes, got clean paging.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T8686

Differential Revision: https://secure.phabricator.com/D13460