headerAlignments are not applied to the header cells

[dkbast]

Describe the bug headerAlignments are not applied to the header cells

To Reproduce Code snippet to reproduce the behavior:

class CustomPdfTable extends pw.StatelessWidget {
  /// The table's columns.
  final List<String> headers;

  /// The table's rows.
  final List<List<String>> rows;

  CustomPdfTable({required this.headers, required this.rows});

  @override
  pw.Widget build(pw.Context context) {
  return pw.Table.fromTextArray(
      data: [headers, ...rows],
      headerStyle: pw.Theme.of(context).defaultTextStyle.copyWith(fontWeight: pw.FontWeight.bold),
      headerDecoration: const pw.BoxDecoration(
        color: PdfColor.fromInt(0xFFEEEEEE),
        border: pw.Border(
          bottom: pw.BorderSide(
            color: PdfColor.fromInt(0xFF000000),
            width: 2,
          ),
        ),
      ),
      headerCellDecoration: const pw.BoxDecoration(
        border: pw.Border(),
      ),
      border: null,
      headerAlignments: {
        0: pw.Alignment.centerLeft,
        1: pw.Alignment.centerLeft,
        2: pw.Alignment.centerRight,
      },
      cellAlignments: {
        0: pw.Alignment.centerLeft,
        1: pw.Alignment.centerLeft,
        2: pw.Alignment.centerRight,
      },
      columnWidths: {
        0: const pw.IntrinsicColumnWidth(flex: 3),
        1: const pw.IntrinsicColumnWidth(flex: 1),
        2: const pw.FixedColumnWidth(100),
      },
    );
  }
}

Expected behavior The right most header should be aligned with the "end" of the table, as are the data fields

Screenshots

Flutter Doctor [✓] Flutter (Channel stable, 3.0.5, on macOS 12.3.1 21E258 darwin-arm, locale en-DE) • Flutter version 3.0.5 at /opt/homebrew/Caskroom/flutter/2.5.3/flutter • Upstream repository https://github.com/flutter/flutter.git • Framework revision f1875d570e (8 weeks ago), 2022-07-13 11:24:16 -0700 • Engine revision e85ea0e79c • Dart version 2.17.6 • DevTools version 2.12.2

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• No issues found!

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