[IMP] product: add monetary widget on list_price

Make consistent display of Sale price and Cost price by showing currency
on both.

opw-668159
Closes #10672

addons/product/product_view.xml

@@ -107,7 +107,7 @@
                                         <field name="type" on_change="onchange_type(type, context)"/>
                                     </group>
                                     <group name="group_standard_price">
-                                        <field name="list_price"/>
+                                        <field name="list_price" widget='monetary' options="{'currency_field': 'currency_id'}"/>
                                         <label for="standard_price" groups="base.group_user"/>
                                         <div name="standard_price_uom" groups="base.group_user">
                                             <field name="standard_price" widget='monetary' options="{'currency_field': 'currency_id'}" class="oe_inline"/>