fix: invalid frontend-platform import in Footer.jsx

[bradenmacdonald]

I am working on some experimental changes to improve frontend-platform, and when modernizing the package.json exports field, I started seeing this error in the course authoring MFE:

According to the frontend-platform documentation, configuration functions like ensureConfig should always be imported from @edx/frontend-platform, not @edx/frontend-platform/config which is actually a "private" implementation file.

Currently, frontend-platform's package.json uses a legacy syntax that lets you import from any files you want within it, but when we modernize it to use the exports field to define the set of public exports, /config will presumably no longer work since it's not part of the public API.

So far, this is the only bad import I've found.

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[mphilbrick211]

@openedx/2u-fed-bom this is ready for review.

[abdullahwaheed]

@bradenmacdonald could you please rebase it with master so we can merge it

[bradenmacdonald]

@abdullahwaheed Sure, done.

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