[FIX] web: list: update buttons when removing a search facet

In an editable list view with at least a facet (e.g. filter) in
the search view, start editing a row, then click on the 'x' to
remove the facet. The view being updated and re-rendered, the row
in edition (if still present) is back in readonly. However, the
buttons in the control panel are not updated ('Save' and 'Discard'
are still displayed, instead of 'Create' and 'Import').

Normally, when the user clicks outside the list, the edition is
left smoothly. However, this scenario is a corner-case because the
element we clicked on (the 'x' in the facet), is no longer in the
DOM when we enter the list '_onWindowClicked' handler, being in
charge of deciding whether or not we should leave the edition. For
this specific case, this handler doesn't leave the edition, because
it assumes that we have clicked on an sub-element of the list that
is no longer in the DOM (e.g. a modal opened from a field widget).
Since it's no longer in the DOM, there is no way to determine
whether it was in the list or not.

This whole '_onWindowClicked' logic is problematic, but we don't
have any better solution for now. So this rev. fixes the issue by
always resetting the buttons to 'readonly' when the view is
updated, which is valid in the case of the list view.

Unfortunately, we couldn't reproduce the bug in a test, because of
a difference between user clicks (with the mouse) in the browser,
and programmatical clicks (triggered in JS) as we do in the tests.
For natural clicks, there is a delay between the (different level
of) handlers call (probably a nextTick) whereas all handlers are
executed in the same tick for programmatically triggered clicks.
For instance, when the user clicks on the 'x' to remove the facet,
the 'click' handler on '.o_facet_remove' is executed, and the
searchbar is re-rendered (new Widget, so next micro-task tick, but
still before the next tick), and in the next tick, the 'click'
handler on 'html' is executed (and the event is triggered on
core.bus, followed by the execution on '_onWindowClicked'). In the
test, both handlers are executed directly, and thus when in
executing '_onWinowClicked', the searchbar hasn't been replaced by
the new one yet, and the clicked '.o_facet_remove' is still in the
DOM. The row is then unselected, and the buttons are correctly
updated.

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