Fix typo at calendar transaction
Summary:
- Fixed conveted => converted
Ref T11576
Test Plan: * Looked at a page, where somebody converted an AllDay Event to a normal one
Reviewers: Blessed Reviewers, epriestley
Reviewed By: Blessed Reviewers, epriestley
Subscribers: epriestley
Tags: Calendar
Maniphest Tasks: T11576
Differential Revision: https://secure.phabricator.com/D16488