[FIX] web: prevent duplicated footers in dialogs

In some cases, we had duplicated footers in form view dialogs.  It
actually happened when the view was reloaded, which is not particularly
frequent, but happens most of the time the user clicks on an action
button, which does not close the window.

To reproduce the issue, you can open the lunch module, click on the
'Feeling Lucky' button.  It will open a form view with a special button
in the footer: 'I'm feeling lucky'.  Clicking on that button will return
an error (no order matches the criterion), and will trigger a form
reload.  Then, you will see two footers: one in the modal footer, the
other one in the form renderer.

The solution to this issue is to make sure, when we update the view and
a footer tag is found in the form renderer, to replace the current
footer buttons by these new buttons.

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