Update pihole DNS configuration in helmfile.yaml

Change the environment variable from DNSMASQ_LISTENING to FTLCONF_dns_listeningMode to align with the latest pihole configuration standards. This update ensures proper DNS listening behavior for the pihole service.

Author: max06

apps/pihole/helmfile.yaml

@@ -18,4 +18,4 @@ releases:
         doh:
           enabled: true
         extraEnvVars:
-          DNSMASQ_LISTENING: all
+          FTLCONF_dns_listeningMode: all