Calendar events in month view should display event names instead of "Away" summary

Summary: Closes T8137, Calendar events in month view should display event names instead of "Away" summary

Test Plan: Open month view in Calendar, all events should display as their actual names.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin, epriestley

Maniphest Tasks: T8137

Differential Revision: https://secure.phabricator.com/D12790