IE Earmuff Compat

A tiny NeoForge compatibility patch for Minecraft 1.21.1 that fixes the Immersive Engineering earmuff crash caused by Tensura: Reincarnated adding a custom SoundSource category at runtime. Instead of letting IE’s client earmuff handler crash on the extra sound category, this patch replaces that part of the logic with a safe dynamic map-based version so both mods can run together. The issue analysis and initial patch were developed with AI assistance, then built and tested in a real modded instance.