Remove monospaced font preference global defaults
Summary: Fixes T7764. These settings have low utility, are no longer used by default, have become less useful on modern Windows which has a better selection of available fonts, and will eventually be subsumed (at least, for the most part) by T4103.
- Grepped for strings.
- Viewed settings.
- Changed font to "24px impact".
- Viewed diffs with default and custom font.
Reviewers: btrahan, chad
Reviewed By: chad
Subscribers: chad, epriestley
Maniphest Tasks: T7764
Differential Revision: https://secure.phabricator.com/D12301