Score CQ WW RTTY as its own contest

CQWWRTTY resolved to the built-in CQ WW with the mode set to digital, and then
scored it as though it were the CW running: a contact inside your own country
worth nothing, two multiplier types, and CQ-WW-SSB in the Cabrillo header. Every
one of those is wrong for RTTY, and wrong quietly, which is the worst way.

RTTY is a different contest wearing the same name. Every contact scores — 1
inside your own country, 2 on your own continent, 3 off it. The exchange carries
the state or province after the zone, and that is a third multiplier per band.
A station outside the US and Canada sends DX there, so the box is not required
and DX brings no multiplier.

The state box being optional is deliberate: most of the log is DX stations, and
holding up an entry for a box that will hold DX costs more than it is worth.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/Nonemm.Contests/ContestRegistry.cs

@@ -10,7 +10,7 @@ public sealed class ContestRegistry
 {
     private static readonly IReadOnlyList<ContestChoice> BuiltIn =
     [
-        new("CQWW", "CQ World Wide DX", [ModeCategory.Cw, ModeCategory.Phone], m => new CqWorldWide(m)),
+        new("CQWW", "CQ World Wide DX", [ModeCategory.Cw, ModeCategory.Phone, ModeCategory.Digital], m => new CqWorldWide(m)),
         new("CQWPX", "CQ WPX", [ModeCategory.Cw, ModeCategory.Phone, ModeCategory.Digital], m => new CqWpx(m)),
         new("ARRLDX", "ARRL International DX", [ModeCategory.Cw, ModeCategory.Phone], m => new ArrlDx(m)),
         new("IARU", "IARU HF World Championship", [ModeCategory.Cw, ModeCategory.Phone], _ => new IaruHf()),