fix: fixed public path replacement

[Asespinel]

This PR aims to fix the improper path replacement from the ORA MFE to work with CDN.

How to test

1. Install this MFE using this branch in a sumac environment you can follow the installation guide .
2. Make sure to have a course with an Open Response Assesment and a student user to submit a response.
3. Open your ORA route as an instructor and you should see your dashboard loading correcly:

[jignaciopm]

@Asespinel I see it well, but could you explain in this PR the reason for the problem and how this solves it?

[Asespinel]

@jignaciopm The problem was that the path was incorrectly being taken in the initialize get method, it was adding '/ora-grading/' at the beginning of the path and hence it wasn't rendering the blocks correctly of each submission