[FIX] web: load SubViews without previous' view _view_ref context keys

On a form view (of model A), define a many2one (model B) with a [form|tree]_view_ref context key
In that view, have a x2m field (model C) with a different [form|tree]_view_ref context key

Before this commit, the second load_views (i.e. on the model C) crashed because
the wrong context key was sent to the server, which returned the view to which the _view_ref points
i.e. the view of the model B

After this commit, we clean the context of subviews loading, because those keys are only useful for the python
and one shot. Hence, there is no crash

OPW 1903780

closes odoo/odoo#28260

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