Remove args redundant with overload

MoreLinq.Test/SpillHeadTest.cs

@@ -138,9 +138,6 @@ from e in
                     Regex.Split(csv.Trim(), @"\r?\n")
                          .Select(line => line.Trim())
                          .SpillHead(h => Regex.Match(h, @"^;\s*(\w+)") is var m & m.Success ? (true, m.Groups[1].Value) : default,
-                                    Enumerable.Empty<string>(),
-                                    MoreEnumerable.Return,
-                                    (a, h) => a.Append(h),
                                     h => MoreEnumerable.Return(h.Index()
                                                                 .ToDictionary(e => e.Value, e => e.Key))
                                                        .SelectMany(d => new[] { "a", "b", "c" },