[FIX] sale: use team_id of saleman before team_id of partner

Before this commit, when we crate a sale, we use the team_id of the partner
even if a saleman has been assigned from another team.

Now we use the saleteam of the saleman if it exists before the saleteam directly.

Task-phung

Fixed case:
Partner are created from lead assigned to Partnership
So team_id on partner are Partnership
After, we assign a saleman to the partner from AM
At each SO, the team_id is Partnership instead of AM

closes odoo/odoo#30549