[FIX] base: copied views are delete too early

Install Invoicing (account) and uninstall it. It results to a an error
because some views required by `payment.acquirer` are deleted before
the acquirers.

The problem is due to the way copied views are deleted, since 1388b7f0
they are removed before the module uninstallation. The related commit
faced a similar problem where copied views were deleted too late
during a module uninstallation.

The two problems are revealing that the copied views have to be removed
as part of the module uninstallation, more precisely after all records
refering to them has been deleted but before the schemas has been
cleaned.

opw-1943286

closes odoo/odoo#31443

Signed-off-by: Raphael Collet (rco) <rco@openerp.com>