parent order-by collection setting ignored in flex-pages UI

[rhukster]

Just noticed this that the column is not ordered based on this setting in 'advanced' tab of the parent. It should be.

[rhukster]

Notes:

Setting is done per page (needs to be in a page with collection defined, e.g. blog.md)

admin:
    children_display_order: collection  

Logic is done in admin/themes/grav/templtaes/pages.html.twig:

{% if page.header.admin.children_display_order == 'collection' and page.header.content.order.by %}
        {% if page.header.content.order.custom %}
            {% set pcol = page.children().order(page.header.content.order.by, page.header.content.order.dir|default('asc'), page.header.content.order.custom) %}
        {% else %}
            {% set pcol = page.children().order(page.header.content.order.by, page.header.content.order.dir|default('asc')) %}
        {% endif %}
    {% else %}
        {% set pcol = page.children() %}
    {% endif %}