fix: URLs get the current value of LMS_BASE_URL from getConfig()

[mariajgrimaldi]

Description

This PR is a backport for #273 so unenrollments work in the learner dashboard.

Resolves openedx/wg-build-test-release#336

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (141d490) 96.36% compared to head (c41ce5d) 96.36%.
Report is 1 commits behind head on open-release/quince.master.

Additional details and impacted files

@@                     Coverage Diff                     @@
##           open-release/quince.master     #284   +/-   ##
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  Coverage                       96.36%   96.36%           
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  Files                             194      194           
  Lines                            1843     1843           
  Branches                          326      326           
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  Hits                             1776     1776           
  Misses                             62       62           
  Partials                            5        5           

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[itsjeyd]

Hey @jsnwesson, this is the backport for #273 which you merged yesterday. Mind giving it a quick look, too? :)

CC @arbrandes

[cmltaWt0]

Tested via a Tutor local deployment. Unenroll feature works great!
Also a Programs URL is formed correctly.

[cmltaWt0]

@itsjeyd I'm going to merge it since the upstream PR literally identical and we have to make a release today.

CC @arbrandes

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