Fix v-update-firewall-ipset path in network startup script

bin/v-update-firewall

@@ -192,7 +192,7 @@ else
         preup="/etc/network/if-pre-up.d/iptables"
         if [ ! -e "$preup" ]; then
             echo '#!/bin/sh' > $preup
-            echo '${HESTIA}/bin/v-update-firewall-ipset' >> $preup
+            echo "${HESTIA}/bin/v-update-firewall-ipset" >> $preup
             echo "/sbin/iptables-restore < /etc/iptables.rules" >> $preup
             echo "exit 0" >> $preup
             chmod +x $preup