Don't save `interface=` line to `dnsmasq`s config file

advanced/01-pihole.conf

@@ -32,8 +32,6 @@ no-resolv
 server=@DNS1@
 server=@DNS2@
 
-interface=@INT@
-
 cache-size=10000
 
 log-queries

automated install/basic-install.sh

@@ -608,7 +608,6 @@ version_check_dnsmasq() {
   echo -n ":::    Copying 01-pihole.conf to /etc/dnsmasq.d/01-pihole.conf..."
   cp ${dnsmasq_pihole_01_snippet} ${dnsmasq_pihole_01_location}
   echo " done."
-  sed -i "s/@INT@/$PIHOLE_INTERFACE/" ${dnsmasq_pihole_01_location}
   if [[ "${PIHOLE_DNS_1}" != "" ]]; then
     sed -i "s/@DNS1@/$PIHOLE_DNS_1/" ${dnsmasq_pihole_01_location}
   else