idna tool uses deprecated UTS46 transitional processing

[medmunds]

The idna.jsp tool's UTS46 column shows the results using "transitional processing"—where deviation characters are handled per IDNA2003 rather than IDNA2008. But in recent versions of UTS46, "the industry has fully transitioned to IDNA2008 behavior, and transitional processing has been deprecated."

It would probably be more useful for the tool to show non-transitional UTS46 results.

To reproduce:

1. Run idna.jsp with ß.example
2. Examine the Punycode line in the UTS46 column

Results: ss.example (matching the IDNA2003 column, indicating transitional processing)
Expected: xn--zca.example (matching the IDNA2008 column, indicating non-transitional processing)