firewall-cmd --state returns 0 on 'running' non 0 on 'not running',

so check retval and not text returned.

FirewallD conversion to multicall

IPTables test

automated install/basic-install.sh

@@ -879,7 +879,7 @@ create_pihole_user() {
 
 configureFirewall() {
   # Allow HTTP and DNS traffic
-  if [[ $(firewall-cmd --state) == "running" ]]; then
+  if firewall-cmd --state &> /dev/null; then
     whiptail --title "Firewall in use" --yesno "We have detected a running firewall\n\nPi-hole currently requires HTTP and DNS port access.\n\n\n\nInstall Pi-hole default firewall rules?" ${r} ${c} || \
     { echo -e ":::\n::: Not installing firewall rulesets."; return 1; }
     echo -e ":::\n:::\n Configuring FirewallD for httpd and dnsmasq."