Fix editing Conpherence rooms on mobile

Summary:
rPd6bce34a5db1a838a988440f09f7728747c9e067 failed to replace all occurrences of $this->getApplicationURI('update/'.$conpherence->getID().'/') with $this->getApplicationURI('edit/'.$conpherence->getID().'/'). Thus editing a Conpherence room on mobile crashes due to using an old invalid path.

Closes T15513

Test Plan:

• Run grep -r "update/" . | grep onpherenc vs grep -r "edit/" . | grep onpherenc and read rPd6bce34a5db1a838a988440f09f7728747c9e067
• Go to a Conpherence room in mobile view and select "Edit Room"
• Go to a Conpherence room in desktop view and select "Edit Room"

Reviewers: O1 Blessed Committers, valerio.bozzolan

Reviewed By: O1 Blessed Committers, valerio.bozzolan

Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Maniphest Tasks: T15513

Differential Revision: https://we.phorge.it/D25879