Update an old SSH redirect URI when editing a bot's SSH keys

Summary: See PHI79. When you edit another user's SSH keys (normally, for a bot account) we currently redirect you to an older URI.

Test Plan:

• Viewed a bot's profile page.
• Clicked "Edit Settings" on the Manage page.
• Went to "SSH Keys".
• Uploaded an SSH key.
• Before: redirected to a 404 after finishing the workflow.
• After: redirected to the same page after the workflow.

Reviewers: amckinley

Reviewed By: amckinley

Differential Revision: https://secure.phabricator.com/D18633