Fix filter/sort order of operations for british spellings

Summary: Currently, if we match "alnd" to "land" and "amend" equally (distance 2), we drop "land" with the other part of the rule. Stop doing that.

Test Plan:
Unit tests. Also:

```
$ arc alnd
Usage Exception: Unknown command 'alnd'. Try 'arc help'.

Did you mean:
    amend
    land
```

Reviewers: vrana

Reviewed By: vrana

CC: aran

Differential Revision: https://secure.phabricator.com/D5033