[Redesign] Normalize button sizes

Summary: Ref T8099, These got bigger in the redesign (font?), and didn't fit in certain spots (Conpherence, Dialogs)

Test Plan: Test new button sizes in Conpherence, Durable Column, Dialogs

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin

Maniphest Tasks: T8099

Differential Revision: https://secure.phabricator.com/D13467