[web] Tweak layout of ThreadSettingsGeneralTab
Summary:
Make some tweaks to ThreadSettingsGeneralTab to space out the form elements a bit and in a more consistent way.
Depends on D3932
Test Plan:
Here's how it looks before and after:
Before:
After:
Reviewers: ashoat, palys-swm
Reviewed By: ashoat
Subscribers: Adrian, karol-bisztyga, yayabosh
Differential Revision: https://phabricator.ashoat.com/D3933