Canvas integration issue with new UI

[cathfitz]

Describe the bug
There is a problem with the SelectOrAdd part of the new U/I.

Overview: There are 3 points of integration. The Course Navigation, Resource Selection, Editor Button.
Course navigation: This is the Select Resources from openEQUELLA link in a canvas course left hand navigation. It uses the structured integration endpoint. This works in both old and new u/i.

The other two use the SelectOrAdd integration endpoint. These work in the old U/I, but not in the new one. In the new U/I, if you select a resource, you get a blank screen when trying to return the resource back to Canvas.

• OpenEquella Version: [e.g. 2020.1]
• OS: [e.g. Windows 10, MacOS 10.13]
• Browser [e.g. Chrome, Firefox]

Additional context
Add any other context about the problem here.

[edalex-ian]

Possibly related to #1725.