Remove exlusion of ContentProvider's notes in ProviderAdmin

[krysal]

Fixes

Fixes #3470 by @AetherUnbound

Description

This small PR enables the notes field in the Django Admin view and also sort the list of providers by 1. media type 2. provider name.

Testing Instructions

just api/up
# Then check any provider from http://localhost:50280/admin/api/contentprovider/

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[AetherUnbound]

Love it, thanks for ordering them too!