[FIX] web, web_diagram: load correct view on direct access/refresh

!! THIS SHOULD NOT BE FORWARDPORTED TO MASTER !!

When loading an action with a specific url (e.g. when refreshing the
browser), the view displayed before refreshing should be loaded
directly (except for form views, for which we need the default
view to be loaded first to keep the breadcrumbs intact).

Before this rev, it automatically first loaded the default
view for the model (i.e. the first view in the views' list), and
then switched to the previously displayed view. This sometimes
produced an error when using a filter needing a field not available
in the default view (e.g. Reporting > Project > Issues Analysis,
switch to the second view 'Graph', and then refresh -> Error).

This revision introduces a new key in the View widget: multi_record.
This key distinguishes views that aim to display several records
(e.g. List, Kanban ...) and those that display a single record (i.e.
Form and Diagram). We use this key to decide whether or not the
view stored in the url should be directly loaded (yes for
multi-record, no otherwise).

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