Revert "Preserve value of HL upon thread-not-found error in setInitial routines"
Revert "Preserve value of HL upon thread-not-found error in setInitial routines"

This reverts commit 7e0e324fb1315fcd95dca37806a04b1b35b71223.

unlimitedbacon/kernel,calcdude84se/knightos-kernel,KnightOS/kernel,KnightOS/kernel