[FIX] web: prevent recreating a deleted record

Before this commit, deleting a record containing
changes (dirty) recreated the record when leaving the view.
Now, the changes are discarded when deleting the
record so it is not marked as dirty and not recreated.

task id: 3063834

closes odoo/odoo#115685

Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>