People calendar month view should pass AphrontFormDateControlValue for start range and end range to MonthView

Summary: Fixes T8181, People calendar month view should pass AphrontFormDateControlValue for start range and end range to MonthView

Test Plan: Open install/p/epriestley/calendar without error

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin, epriestley

Maniphest Tasks: T8181

Differential Revision: https://secure.phabricator.com/D12827