Fixed hard-coded dashboard.local link in provider redirect

[bodom0015]

Problem

A hard-coded value for https://dashboard.local.wholetale.org/settings was left in the controller for the User Settings view. This obviously will not work in production.

Approach

Replace the hard-coded hostname with config.wholeTaleHost instead. This value is populated from an environment variable using sed when the Ember dashboard is built.

How to Test

1. Checkout and run this branch locally, rebuild the dashboard
2. Login to the WholeTale Dashboard
3. Navigate to the "User Settings" view
4. Connect an OAuth or DataONE provider
   • After authenticating/authorizing, you should be redirected back to the dashboard