Use network constant URL_USER_DETAILS instead of hardcoding path

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      1. Description

SE-146, OSPR

This app has been upgraded to use the new mobile API v1, however the current named platform release [`open-release/hawthorn.2` only supports mobile API v0.5](https://github.com/edx/edx-platform/blob/open-release/hawthorn.2/lms/urls.py#L162-L165).

This change maintains the current master mobile API v1, but makes it easier for whitelisted app releases to use the legacy mobile API v0.5 instead (using patches).

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      1. Notes

• This has been successfully tested with the app `release/2.17.0`, but we acknowledge that future releases may drop support for the legacy mobile API v0.5.

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      1. How to test this PR

1. Build and run the app.
1. Login as a user on the LMS
1. Check that the user's course enrollments load successfully.

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      1. Reviewers

• [ ] @symbolist

• [ ] edX Reviewers TBD