remove "which pfctl"

We assume that if the jail has an ip4.addr value, then pfctl is obviously installed.

It is also not invoked by start, so stop should not need it either.

usr/local/share/bastille/stop.sh

@@ -55,7 +55,7 @@ for _jail in ${JAILS}; do
         _ip4="$( bastille config ${_jail} get ip4.addr )"
 
         # Check if pfctl is present
-        if [ which -s pfctl ] && [ "${_ip4}" != "not set" ]; then
+        if [ "${_ip4}" != "not set" ]; then
             if [ "$(bastille rdr ${_jail} list)" ]; then
                 bastille rdr ${_jail} clear
             fi