fix: frozen owlmoji

[kellyjosephprice]

	Ref RM-10740

🧰 Changes

Fix loading owlmoji's.

The ast appears to be frozen, but I'm not sure where that's happening. The image doesn't strictly need the src on the hProperties since rehype will add it later, so this should be fine still.

🧬 QA & Testing

Not sure how to reproduce this yet.

• Broken on production.
• Working in this PR app.