Reset port 443 redirect during sanitize

Clear iptables-restore service and rules so wizard can reconfigure
fresh. Fixes MOTD showing wrong port after re-running wizard.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

rpi/sanitize-for-image.sh

@@ -227,6 +227,14 @@ rm -rf /home/*/stegasoo/frontends/web/certs/
 # Remove any .env files with channel keys
 rm -f /opt/stegasoo/frontends/web/.env 2>/dev/null
 rm -f /home/*/stegasoo/frontends/web/.env
+# Reset port 443 redirect (user reconfigures in wizard)
+if systemctl is-enabled --quiet iptables-restore 2>/dev/null; then
+    systemctl disable iptables-restore 2>/dev/null || true
+    rm -f /etc/systemd/system/iptables-restore.service
+    rm -f /etc/iptables.rules
+    iptables -t nat -F PREROUTING 2>/dev/null || true
+    echo "  Port 443 redirect cleared"
+fi
 echo "  Stegasoo instance data cleared"
 
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