Fix Camptown Races melody from lead sheet image

Old version had the Doo-dah phrase completely wrong (D E F E D C)
and a truncated chorus. Now matches the D-major lead sheet:

Verse: G G E G A G E C | D D (Doo-dah!) | E E F E D C | C(held)
Chorus: C E G G | G E G A G E C | G A B A G E | D D C(held)

Reduced passes 5→3 since the theme is now a full verse+chorus.

https://claude.ai/code/session_01DXp3FLfbb8jFHvCJ29uWk1

index.html

@@ -1825,10 +1825,10 @@ const FOLK_PIECES=(function(){
 
   // ── Camptown Races ──
   var camptown=folk("Camptown Races","Stephen Foster (1850)",140,
-    [G4,G4,E4,G4,A4,G4,E4,C4,D4,E4,F4,E4,D4,C4,C4,E4,G4,G4,E4,G4,A4,G4,E4,C4],
-    [3,3,2,3,0,3,2,0,1,2,1,2,1,0,0,2,3,3,2,3,0,3,2,0],
-    [1,1,1,1,1,1,1,2,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,3],
-    5,C4);
+    [G4,G4,E4,G4,A4,G4,E4,C4,D4,D4,E4,E4,F4,E4,D4,C4,C4,E4,G4,G4,G4,E4,G4,A4,G4,E4,C4,G4,A4,B4,A4,G4,E4,D4,D4,C4],
+    [3,3,2,3,0,3,2,0,1,1,2,2,1,2,1,0,0,2,3,3,3,2,3,0,3,2,0,3,0,3,0,3,2,1,1,0],
+    [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,3,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,3],
+    3,C4);
 
   // ── Red River Valley ──
   var redriver=folk("Red River Valley","American Traditional (1870s)",85,