Original PR description

SOC for ir.ui.view creation. If a view is created without a website_id,
it should get one if one is present in the context. Also check that
an explicit website_id in create values matches the one in the context.

Note: it was already the case but kinda by chance and not entirely
correct. Most of the time, the 'arch' field was specified as a creation
value... and as it is a computed field with an inverse method, a COW
was triggered. But this had also the inconvenient of creating an extra
generic view without any arch.