Emojis should not be converted to Unicode sequence

[josephmturner]

Hello! Thank you for exwm-edit!

I've noticed that exwm-edit--compose converts emojis to their Unicode key sequences.

To reproduce:

Given some text with an emoji, like 🐯, call exwm-edit--compose

Expected:

🐯 appears in the *exwm-edit* buffer, according to your system fonts.

Actual:

\U0001f42f appears in the buffer, and upon calling exwm-edit--finish, 🐯 is replaced with \U0001f42f.