Since 11.0 88b75f15 the wishlist can't contain duplicates: thus if we
remove an element from wishlist (by adding it to cart or removing) there
is an error next times it is added (since the product is already in
wishlist but archived until next garbage collection).

opw-2074843
closes #37235

Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>