Fix Passphrase Credential dialog
Summary: Fixes T10772, not sure why this fails, but reverting the code back to old dialog call works.
- Try to add a new credential when importing a repository.
- Also created a new credential normally, via Passphrase.
- Also edited a credential.
Reviewed By: chad
Maniphest Tasks: T10772
Differential Revision: https://secure.phabricator.com/D15691