Calendar - fix inline display of status icon

Summary: Fixes T5663. Said task kind of stalled out and maybe @chad wanted to take a different approach, but this works? Also, I think fixing any new bugs that may emerge with more reasonable css scoping seems like a reasonable path forward.

Test Plan: inline display of status icon looked correct in differential

Reviewers: epriestley, chad

Reviewed By: chad

Subscribers: epriestley, chad, Korvin

Maniphest Tasks: T5663

Differential Revision: https://secure.phabricator.com/D10084