Correctly display event id and sequence in crumb and page title on eventviewcontroller

Summary: Fixes T8459, Correctly display event id and sequence in crumb and page title on eventviewcontroller

Test Plan: Open E111/3, crumb and title should display 'E111 (3)' instead of 'E111'.

Reviewers: Blessed Reviewers, epriestley

Reviewed By: Blessed Reviewers, epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T8459

Differential Revision: https://secure.phabricator.com/D13211