Remove duplicated fastcgi.server config. Same as the commit in #5103, but...

Co-authored-by: RD WebDesign <github@rdwebdesign.com.br>
Signed-off-by: Adam Warner <me@adamwarner.co.uk>

advanced/pihole-admin.conf

@@ -15,16 +15,6 @@
 $HTTP["url"] =~ "^/admin/" {
     server.document-root = "/var/www/html"
     server.stream-response-body = 1
-    fastcgi.server = (
-        ".php" => (
-            "localhost" => (
-                "socket" => "/tmp/pihole-php-fastcgi.socket",
-                "bin-path" => "/usr/bin/php-cgi",
-                "min-procs" => 0,
-                "max-procs" => 1,
-            )
-        )
-    )
 
     # X-Pi-hole is a response header for debugging using curl -I
     # X-Frame-Options prevents clickjacking attacks and helps ensure your content is not embedded into other sites via < frame >, < iframe > or < object >.