Change target_link_uri in LTI config JSON

[dgwn]

Per this page: https://github.com/ucfopen/UDOIT/blame/81b5f09014ba9136141468978a49b3d4c83e33a3/INSTALL_CANVAS.md#L23

Redirect URI should be set to

* <YOUR_UDOIT_BASE_URL>/authorize/check

If this is the case, we should consider updating the controller built JSON to auto-populate this field to the correct endpoint. It currently is set to "{$baseUrl}/dashboard" [code permalink].

Note: the above two target_link_uris should be left as /dashboard and /admin, as they are placement specific.