Sort the elements of ett[] to match the definitions, and add a missing entry.

Sorted so that we can find missing entries; fixed so that there aren't
any missing entries.

Change-Id: Ic05e4d30f7b65be5ecbba3ff89b7bd13870aba25
Reviewed-on: https://code.wireshark.org/review/3684
Reviewed-by: Guy Harris <guy@alum.mit.edu>