Improve rendering of Herald rules in "Another Herald rule..." field
Summary:
Fixes T9136.
- Fix a bug where the name is rendered improperly.
- Put disabled rules at the bottom.
- Always show the rule monogram so you can distingiush between rules with the same name.
Test Plan:
Maniphest Tasks: T9136
Differential Revision: https://secure.phabricator.com/D20798