[FIX] point_of_sale: add rank to customer on sale
[FIX] point_of_sale: add rank to customer on sale

It is a partial revert of the commit: https://github.com/odoo/odoo/commit/36c05f5e056794d68c363343e267c592bd9bce31
because the behavior has been fixed in stable in commit https://github.com/odoo/odoo/commit/577dac5baee5e503baba9f30dff67e69daafa00b
almost at the same time.

So no need of double increade the ranking of a sale in the POS.

closes odoo/odoo#42397

Signed-off-by: pimodoo <16075eed7f0f1db85d54c35d23e6589f4efb5038@users.noreply.github.com>

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