[FIX] mrp: location_id domain on mrp.routing

Steps to reproduce the bug:

- Create a routing with a Product Location of type view
- Create a MO with this routing
- Click on "Plan" without clicking on "Check for Availability"
- Complete the work orders
- Go back to the MO and try to put it in state "Done"

Bug:

Impossible to set the MO on state "Done". By clicking on "Mark as Done",
it returns:

You cannot take products from or deliver products to a location of type "view"

opw:803580

addons/mrp/views/mrp_routing_views.xml

@@ -85,7 +85,7 @@
                                 <field name="name"/>
                             </group>
                             <group>
-                                <field name="location_id" groups="stock.group_adv_location"/>
+                                <field name="location_id" groups="stock.group_adv_location" domain="[('usage', '!=', 'view')]"/>
                                 <field name="company_id" options="{'no_create': True}" groups="base.group_multi_company"/>
                            </group>
                         </group>