R1:75e1a0d5a838

Fix celerity_mapper.php @generated issue

Summary: Easy

Test Plan: Run ##scripts/celerity_mapper.php webroot/##, verify
src/__celerity_resource_map__.php

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: aran, epriestley

Differential Revision: 1133