Review Mozilla 1956172: The downloaded file is not completely deleted from the app and still remains on the phone

🔍 Bugzilla Audit

Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1956172

Commit: 420eb15e

Description

Possible disk leak?

Also, upstream removed android:defaultValue="false" from the pref @string/pref_key_external_download_manager in mobile/android/fenix/app/src/main/res/xml/preferences.xml. We should check if we need it.

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