Calendar items in Upcoming Events query should link to events, not calendar

Summary: Closes T7933, Calendar items in Upcoming Events query should link to events, not calendar.

Test Plan: Open Upcoming Events query, click on an event, event detail view should open.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T7933

Differential Revision: https://secure.phabricator.com/D12631