erp5_test_result: always show the Periodicity view

I don’t understand why the periodicity view of the test suite is conditioned by a checkbox: “Periodicity Enabled”.

One issue is that in the RenderJS UI, we need to refresh the page in order for this view to appear in the panel.

When looking at other periodicity views, such as:

https://lab.nexedi.com/nexedi/erp5/-/blob/master/product/ERP5/bootstrap/erp5_core/ActionTemplateItem/portal_types/Alarm/periodicity.xml https://lab.nexedi.com/nexedi/erp5/-/blob/master/bt5/erp5_open_trade_periodicity_line/ActionTemplateItem/portal_types/Periodicity%20Line/periodicity.xml

they are always shown.

Let’s unify the behavior to make it simple