converters/simdutf: remove stray patch
This was left over after a wrong rebase (mid-air collission).
Fixes: 81f18785a4d12bf1d01751f5e54643cf9afe9443
Reported by: Einar Bjarni Halldórsson <einar@isnic.is>
PR: 298403
Event: EuroBSDcon Devsummit 2026