Fix Encode: remove str to lower

Check code style

idna.php

@@ -64,8 +64,6 @@ function EncodePunycodeIDN( $value )
     $mb_internal_enc = mb_internal_encoding();
     mb_internal_encoding( "UTF-8" );
 
-    $value = mb_strtolower( $value );
-
     /* http://tools.ietf.org/html/rfc3492#section-6.3 */
     $n      = 0x80;
     $delta  = 0;
@@ -315,6 +313,7 @@ function DecodePunycodeIDN($value)
          );
         ++$i;
       }
+
     return implode( '', $output );
   }