fix($compile): updating the jQuery .context when it is replaced

[jbedard]

This allows replaced DOM nodes to be GCed when using jQuery. The issue is pretty minor and the jQuery .context might be removed in the future (see https://api.jquery.com/context/), but the fix is pretty simple.

Fixes #7900

[mary-poppins]

Thanks for the PR! Please check the items below to help us merge this faster. See the contributing docs for more information.

• Uses the issue template (#8253)

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Thanks again for your help!

[mgol]

I'll look into it.