Remove workaround: Exported keys starting with "PLIB"

[blochberger]

See AppPETs/PrivacyKit@8cb2ea3, AppPETs/PrivacyKit@bee91a0, AppPETs/PrivacyKit@b4884c8, and AppPETs/PrivacyKit@751ca70.

This issue was migrated from https://gitlab.prae.me/apppets/Todo-iOS/issues/2.