Fix warehouse propagation in MTO procurements

[jcadhoc]

Summary

• override stock.move._prepare_procurement_values() in stock_ux to propagate the warehouse that owns the physical source location
• avoid reusing draft RFQs from a different warehouse in multi-warehouse MTO chains
• prevent purchase orders from mixing destinations from different warehouses and later failing the operation type consistency check

Why

In some multi-warehouse MTO flows the move still carries the commercial warehouse in warehouse_id even though its real source location belongs to another warehouse. That stale value is propagated to the next procurement and can attach buy procurements to a draft RFQ from the wrong warehouse.

[roboadhoc]