[MC-90000] Elytra model doesn't adjust when sneaking

To reproduce, wear an Elytra and sneak. The wings won't adjust to your lowered shoulder height and angled back. This also happens while gliding.

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First off, congratulations on being the 90,000th bug report!

Secondly, and unfortunately, its a dupe of MC-89975

Shame on me. Thank you.

No problem! 😉