Moderation settings fixes (#1336)

* Default isAdultContentEnabled to false on all devices.

The original intent of setting the default based on the device was
to make the maximally-permissive choice. It turns out this was a
mistake as it created sync issues between devices; users would be
confused by the lack of congruity between them. We have to go with
false by default to ensure sync is retained.

* Update preferences model to use new sdk api

* Delete dead code

* Dont show the iOS adult content warning in content filtering settings if adult content is enabled

* Bump @atproto/api@0.6.8

* Codebase style consistency

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