[web] [fix] add the right icon the chat tabs
Summary:
per figma this is the right icon. When uploading to icomoon I forgot to re-name it. Not sure it's a big deal. Letting y'all decide.
before:
after:
https://www.figma.com/file/a1nkbWgbgjRlrOY9LVurTz/Comm-%2F-Desktop-app?node-id=1170%3A79456
Test Plan: should look like figma
Reviewers: atul, ashoat
Reviewed By: atul, ashoat
Subscribers: ashoat, palys-swm, Adrian, karol-bisztyga
Differential Revision: https://phabricator.ashoat.com/D3142