Revert "Reorder remarkup block rules for consistency with PhabricatorMarkupEngine"

Summary:
This reverts commit c0370f2f3c140d5048034ffdab617af7631d14ad.

The sorting behavior has changed between PHP 5 and 7. The msort at libphutil/src/markup/engine/PhutilRemarkupEngine.php:44 reorders slightly differently.

Test Plan: php5 ../arcanist/scripts/arcanist.php unit now doesn't show an error.

Reviewers: epriestley, Blessed Reviewers

Reviewed By: epriestley, Blessed Reviewers

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D15862