Reduce some code duplication in PhortuneLandingController

Summary: Ref T12451. This code is the same as the other code.

Test Plan: Went through the default-account case with this code, worked the same as the other code.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12451

Differential Revision: https://secure.phabricator.com/D17693