[4.x] List filter accessibility

[brianteeman]

Steps to reproduce the issue

Create a menu of type Articles Category List
Create a menu of type List all contacts in a category

Enable the display filter option in both

In both components a filter field with a filter button is displayed. ✔️✔️
In both components the filter is activated not by the button but simply by moving the focus anywhere other than the filter ❌❌