(mvc) fix integer validator to deny leading zeros

src/opnsense/mvc/app/models/OPNsense/Base/Validators/IntegerValidator.php

@@ -51,8 +51,7 @@ class IntegerValidator extends Validator implements ValidatorInterface
     {
         $value = $validator->getValue($attribute);
         $msg = $this->getOption('message');
-
-        if (ctype_digit(strval(($value))) == false) {
+        if (ctype_digit(strval(($value))) == false or (string)((int)$value) !== (string)$value) {
             $validator->appendMessage(new Message($msg, $attribute, 'IntegerValidator'));
             return false;
         }