Set default errDiv to 6. Not quite so noisy

src/dhgr.tk/utils/dhgrrgb.pla

@@ -113,7 +113,7 @@ byte gamma     = 1 // Gamma correction
 var brightness = 0
 var saturation = 255 // 1.0
 var tint       = 22 // 45/2 deg
-byte errDiv    = 3
+byte errDiv    = 6
 byte flags     = 0
 var rgbErr // Running color error array
 var arg