Review Mozilla 1976213: The checkboxes for Tracking Protection exceptions are checked for a moment after an update

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Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1976213

Commit: d99d64ed

Description

This commit introduced a runtime migration that looks for "@mozilla.org/url-classifier/exception-list-service;1", so it becomes a runtime error for us when we open the settings.

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