install_openvpn: mullvad-up.sh: fixed route

roles/install_openvpn/files/mullvad-up.sh

@@ -1,8 +1,8 @@
 #!/bin/bash
 #/sbin/ip route replace default via $4 table ffmyk
 sleep 3
-echo Reroute via $4
-ip route replace 0.0.0.0/1 via $4 table ffmyk
-ip route replace 128.0.0.0/1 via $4 table ffmyk
+echo Reroute via $route_vpn_gateway
+ip route replace 0.0.0.0/1 via $route_vpn_gateway table ffmyk
+ip route replace 128.0.0.0/1 via $route_vpn_gateway table ffmyk
 
 exit 0