Update addToListArrayHeader in AggregatedColumn to match parent's definition

[jgarifuna]

In:

atk/src/Attributes/AggregatedColumn.php

Update the following to match parent's definition:

public function addToListArrayHeader($action, &$arr, $fieldprefix, $flags, $atksearch, $atkorderby)

add:

use Sintattica\Atk\DataGrid\DataGrid;

Change to this:
public function addToListArrayHeader($action, &$arr, $fieldprefix, $flags, $atksearch, $atkorderby, DataGrid $grid = null, $column = '*')