[FIX] web: list: hide export button when list empty

Before this commit, at first rendering, the export button was
displayed in the list view even if the list was empty.

The issue occurred because at first rendering, the buttons aren't
moved inside the control panel yet (this is done in the 'mounted'
hook of the control panel). As we render in a fragment, the hook
is called later on, when everything is ready and inserted into the
DOM.

We'll get rid of these painful manipulations as soon as everything
will be converted to OWL.

Task 2294306

closes odoo/odoo#54307

Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>

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