Fixed idn_to_ascii function call to prevent incorrect translation

Without the `IDNA_NONTRANSITIONAL_TO_ASCII` parameter, domain `faß.de`
gets converted to `fass.de` that is not correct way of making IDN.

Follows http://www.unicode.org/reports/tr46/

framework/validators/EmailValidator.php

@@ -112,7 +112,7 @@ class EmailValidator extends Validator
             return idn_to_ascii($idn);
         }
 
-        return idn_to_ascii($idn, 0, INTL_IDNA_VARIANT_UTS46);
+        return idn_to_ascii($idn, IDNA_NONTRANSITIONAL_TO_ASCII, INTL_IDNA_VARIANT_UTS46);
     }
 
     /**

framework/validators/UrlValidator.php

@@ -115,7 +115,7 @@ class UrlValidator extends Validator
             return idn_to_ascii($idn);
         }
 
-        return idn_to_ascii($idn, 0, INTL_IDNA_VARIANT_UTS46);
+        return idn_to_ascii($idn, IDNA_NONTRANSITIONAL_TO_ASCII, INTL_IDNA_VARIANT_UTS46);
     }
 
     /**