Patch for Worpress Pages Children plugin 1.5.2.1 issue with taxonomy pages

fix

Ref: http://wordpress.org/plugins/pages-children/

With the plugin v1.5.2.1 I get an error 'unsupported operand types class-wp-list-table.php on line 144'

To fix correct the missing $ in front of the arg variable on line 390 of pages-children.php : 

    return arg; 

should be

    return $args;