Fix `LIGHTTPD_ENABLED` dupes in `setupVars.conf`

* Fix issue merged [here](fdf2649f2f (diff-689793e68cde6270d074695b71c969afL1488))

automated install/basic-install.sh

@@ -1450,7 +1450,7 @@ finalExports() {
   # If the setup variable file exists,
   if [[ -e "${setupVars}" ]]; then
     # update the variables in the file
-    sed -i.update.bak '/PIHOLE_INTERFACE/d;/IPV4_ADDRESS/d;/IPV6_ADDRESS/d;/PIHOLE_DNS_1/d;/PIHOLE_DNS_2/d;/QUERY_LOGGING/d;/INSTALL_WEB/d;' "${setupVars}"
+    sed -i.update.bak '/PIHOLE_INTERFACE/d;/IPV4_ADDRESS/d;/IPV6_ADDRESS/d;/PIHOLE_DNS_1/d;/PIHOLE_DNS_2/d;/QUERY_LOGGING/d;/INSTALL_WEB/d;/LIGHTTPD_ENABLED/d;' "${setupVars}"
   fi
   # echo the information to the user
     {