[FIX] purchase: wrong list price UoM

Steps to reproduce:
- Install Sale and Purchase and enable UoM
- Change 'Acoustic bloc screen' purchase UoM to dozen
- Create a PO for that product
- Access the product page from PO line
- Wrong Sales price

Bug:
the jsonrpc to read product data needlesslt sends the UoM in the context
which leads to the sales price being updated by _compute_product_lst_price

Fix:
remove UoM from procut context as it is not necessary

opw-3434574

closes odoo/odoo#140957

X-original-commit: fe04d61a886fa7b461ebf9bda2d7479fb69281cd
Signed-off-by: William Henrotin (whe) <whe@odoo.com>
Signed-off-by: Walid Hanniche (waha) <waha@odoo.com>

addons/purchase/views/purchase_views.xml

@@ -235,7 +235,7 @@
                                         readonly="state in ('purchase', 'to approve', 'done', 'cancel')"
                                         required="not display_type"
                                         width="35%"
-                                        context="{'partner_id':parent.partner_id, 'quantity':product_qty,'uom':product_uom, 'company_id': parent.company_id}"
+                                        context="{'partner_id':parent.partner_id, 'quantity':product_qty, 'company_id': parent.company_id}"
                                         force_save="1" domain="[('purchase_ok', '=', True), '|', ('company_id', '=', False), ('company_id', '=', parent.company_id)]"/>
                                     <field name="name" widget="section_and_note_text"/>
                                     <field name="date_planned" optional="hide" required="not display_type" force_save="1"/>