Trust that tzupdate is on the ISO

build-iso.sh bakes tzupdate into the live environment, so the runtime
pacman fallback was dead there — and in a dry run on a dev machine it
would install a package as a side effect. tzupdate -p already fails
gracefully into the manual timezone filter when the tool is missing.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

configs/airootfs/root/configurator

@@ -36,9 +36,6 @@ clear_logo() {
   gum style --foreground 2 --padding "1 0 0 $PADDING_LEFT" "$(<"$LOGO_PATH")"
 }
 
-# Ensure tzupdate is available for guessing timezone
-command -v tzupdate >/dev/null || sudo pacman -Sy --noconfirm tzupdate
-
 abort() {
   gum style "${1:-Aborted installation}"
   echo