Fix inverse logic when adding domains on the group management pages.

Signed-off-by: DL6ER <dl6er@dl6er.de>

scripts/pi-hole/php/queryads.php

@@ -9,6 +9,7 @@
 while (ob_get_level() > 0) {
     ob_end_flush();
 }
+require_once("func.php");
 ini_set("output_buffering", "0");
 ob_implicit_flush(true);
 header('Content-Type: text/event-stream');
@@ -21,16 +22,6 @@ function echoEvent($datatext) {
       echo $datatext;
 }
 
-// Credit: http://stackoverflow.com/a/4694816/2087442
-ini_set("pcre.recursion_limit", 1500);
-function validDomain($domain_name)
-{
-    return ($domain_name[0] !== '-' // Don't allow domains to appear as command line options
-            && preg_match("/^((-|_)*[a-z\d]((-|_)*[a-z\d])*(-|_)*)(\.(-|_)*([a-z\d]((-|_)*[a-z\d])*))*$/i", $domain_name) // Valid chars check
-            && preg_match("/^.{1,253}$/", $domain_name) // Overall length check
-            && preg_match("/^[^\.]{1,63}(\.[^\.]{1,63})*$/", $domain_name)   ); // Length of each label
-}
-
 // Test if domain is set
 if(isset($_GET["domain"]))
 {