Format the php files

Summary: This is a prerequisite to enforcing a custom phabricator-like coding standard through a linter.

Test Plan:
Should run with no exception:

arc lint --everything

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Subscribers: schancel

Differential Revision: https://reviews.bitcoinabc.org/D2760