Backport fix: sync LMS_BASE_URL for bookmark API if changed

[ghassanmas]

This change makes it possible to use the latest LMS_BASE_API
if it was changed because of dynamic config API, which is the
default case of tutor.

This changes closes openedx/wg-build-test-release/issues/270

Fixes that are simlar to this

• gradebook feat: ensure lms api synced with latest value in config frontend-app-gradebook#290
• course authoring fix: force studio url to reload if changed frontend-app-authoring#389

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (open-release/olive.master@c7ca1ba). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@                     Coverage Diff                      @@
##             open-release/olive.master    #1125   +/-   ##
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  Coverage                             ?   84.36%           
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  Lines                                ?     4560           
  Branches                             ?     1178           
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  Hits                                 ?     3847           
  Misses                               ?      693           
  Partials                             ?       20           

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[itsjeyd]

Thanks for this contribution @ghassanmas!

@arbrandes Would you have time to give this Olive backport of #1120 a quick look?

[arbrandes]

Looks good to me!

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