[FIX] purchase_stock: confuse return move and move dest

Increasing the quantity on a purchase order line will create a stock
move with the delta quantity. In case the purchase order has a return
among its picking_ids, the delta will be wrong.

This is due to the fact a return move is considered like a move_dest
of the original incoming move. The delta quantity will be computed
from the return move which doens't make sense.

This commit excludes outgoing moves from move_dest to avoid taking
return move into account.

closes odoo/odoo#44551

Signed-off-by: Arnold Moyaux <amoyaux@users.noreply.github.com>

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