Revert "Fix: Permission.PUSH_MERGE checking for push bypassing Gerrit"

This reverts commit f6159bed862ce09d8e801fd02d50ec3476f53634.

Broke direct push of merges for all projects that followed
documentation and included a 'Push Merge Commit' ACL prefixed with
"refs/for/".

The fix for the 'Push Merge Commit' handling looks good, but it should
be accompanied by a migration that adjusts existing configuration.

Change-Id: Id2a25551d8e9953cd1e678086d491133f5f2d987
5 files changed