[FIX] stock, purchase_stock: apply putaway strategy even if no package

Steps to reproduce the bug:
- Enable “Storage location” option
- Create a storable product “P1”
- Create a putaway rule:
    - When in: WH/Stock
    - Store to: WH/Stock/shelf1
    - product: P1
- Go to operation types -> “Receipts orders”
    - Enable “Show Detailed operations” and
    “Pre-fill detailed operations”
- Create a purchase order:
     - Add 2unit of “P1”
     - Confirm the PO
- Go to the receipt:
     - the destination location is correctly set “WH/stock/shelf1”
     - set the qty done to 1
     - validate the delivery and create a back order

Problem:
The destination location is “WH/Stock” instead of “WH/stock/shelf1”
because the ```_apply_putaway_strategy``` function is not called on
the ```stock.move.line``` when there is no package

opw-3162934

closes odoo/odoo#112227

Signed-off-by: William Henrotin (whe) <whe@odoo.com>