Calendar day view and corresponding sidebar should correctly display all all-day events returned from query

Summary: Closes T8085, Calendar day view and corresponding sidebar should correctly display all all-day events returned from query

Test Plan: Open day view with all-day and multi-day events, all events should correctly be drawn in day view in correct order, and sidebar preview should correctly mark future day boxes with all day events.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin, epriestley

Maniphest Tasks: T8085

Differential Revision: https://secure.phabricator.com/D12776