删除WPF DataGrid标题列的左边框网格线以匹配数据网格线

<DataGrid>
    <DataGrid.ColumnHeaderStyle>
       <Style TargetType="{x:Type DataGridColumnHeader}">
           <Setter Property="Template">
               <Setter.Value>
                   <ControlTemplate TargetType="{x:Type DataGridColumnHeader}">
                        <Grid>
                            <Grid.ColumnDefinitions>
                               <ColumnDefinition Width="*" />
                               <ColumnDefinition Width="Auto" />
                            </Grid.ColumnDefinitions>
                           <Border BorderThickness="0,0,0,1" BorderBrush="Black">
                               <ContentPresenter />
                            </Border>
                            <Path Grid.Column="1" Data="M0,0 L1,0 L1,1 L0,1 Z" Stroke="Black" StrokeThickness="1" />
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </DataGrid.ColumnHeaderStyle>
    <DataGrid.CellStyle>
       <Style TargetType="{x:Type DataGridCell}">
           <Setter Property="Template">
               <Setter.Value>
                   <ControlTemplate TargetType="{x:Type DataGridCell}">
                        <Grid>
                            <Grid.ColumnDefinitions>
                               <ColumnDefinition Width="*" />
                               <ColumnDefinition Width="Auto" />
                            </Grid.ColumnDefinitions>
                           <Border BorderThickness="0,0,0,1" BorderBrush="Black">
                               <ContentPresenter />
                            </Border>
                            <Path Grid.Column="1" Data="M0,0 L1,0 L1,1 L0,1 Z" Stroke="Black" StrokeThickness="1" />
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </DataGrid.CellStyle>
</DataGrid>