[FIX] stock: create picking on mobile

Before this commit, it was not possible to create a new picking on
mobile if this picking has multiple moves.

How to reproduce:
- Open Odoo on mobile (or on desktop but simulate mobile device with
  devtools);
- Inventory > Operations > Transfers;
- Create a new transfer (a receipt for example);
- In its operations (moves), add a new product, then add a second
  product.
- Try to save or validate the picking -> A warning prevent to do it,
  saying you're trying to write on the field `product_qty` instead of
  the field `product_uom_qty`.

What's happening:
For a unknown reason, the fields from the `stock.move` list view are
saved once a second move is created, even if we're using the kanban view
in the mobile version.
To avoid this issue, we force the `force_save` to be false for the field
`product_qty` in the kanban view. That's way, it prevents the issue.

OPW-3577844

X-original-commit: 818e7fcfd88fa9fe2927e327f4510b108a47c370
Part-of: odoo/odoo#144282

addons/stock/views/stock_move_views.xml

@@ -101,7 +101,7 @@
                     <field name="product_id"/>
                     <field name="show_details_visible"/>
                     <field name="product_uom_qty"/>
-                    <field name="product_qty"/>
+                    <field name="product_qty" readonly="1" force_save="0"/>
                     <field name="quantity"/>
                     <field name="is_inventory"/>
                     <field name="state"/>