On 02/09/2024 at around 8pm UTC, Discord flipped an experiment (2023-09_mobile_redesign_override_toggles) which ignores the layout toggle that this script relied on.
If you want to continue using the old layout, you can either use a modded mobile client to disable that experiment, or downgrade to an old version of the app (presumably one from September 2023 or earlier).
Thank you for using my silly piece of code! I hope I've helped you enjoy your favorite version of Discord for a little longer :)