web: remove config option to control FLoC

It has been abandoned by Google. Keep the default opt-out value for a
little longer just in case though.

web/rootfs/defaults/meet.conf

@@ -25,9 +25,8 @@ add_header X-XSS-Protection "1; mode=block";
 add_header X-Jitsi-Shard {{ .Env.DEPLOYMENTINFO_SHARD }};
 {{ end }}
 
-{{ if not (.Env.ENABLE_FLOC | default "0" | toBool) }}
+# Opt out of FLoC (deprecated)
 add_header Permissions-Policy "interest-cohort=()";
-{{ end }}
 
 location = /config.js {
     alias /config/config.js;