Remove logic from settings controller for UPE being disabled

[daledupreez]

Changes proposed in this Pull Request:

This PR explores removing some logic from the settings controller that handles the case where UPE is disabled, as UPE can no longer be disabled.

Testing instructions

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• Covered with tests (or have a good reason not to test in description ☝️)
• Tested on mobile (or does not apply)

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• Added testing instructions to the Release Testing Instructions wiki page (or does not apply)
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