Mastodon 4.4+ clients read quotes from a top-level quote object with
state and quoted_status; Pleroma only had pleroma.quote, so they did
not show quote posts. Quoted statuses get a shallow quote with only
quoted_status_id, as quotes are rendered one level deep.
Inspired by Akkoma 5b7209980, which can not use the shallow form because
Akkoma already had a top-level quote status.
