[FIX] fleet: missing avatar image for model and vehicle field

before this commit, in the list view of
fleet (fleet.vehicle),
services (fleet.vehicle.log.services) and
odometer(fleet.vehicle.odometer) the vehicle_id
and model_id field with many2one_avatar is
not showing the image of vehicle and model.

* open fleet -> fleet -> fleet
* switch to list view
* model field will be with empty image
* similarly in services and odometer menus

after this commit, the widget will be removed
from the field as the avatar field doesn't
exists in the model level.

closes odoo/odoo#117752

X-original-commit: e57b6f898775a0e432ae1a21266a0f4bf82c0242
Signed-off-by: Kevin Baptiste <kba@odoo.com>

addons/fleet/models/fleet_vehicle.py

@@ -18,7 +18,7 @@ MODEL_FIELDS_TO_VEHICLE = {
 }
 
 class FleetVehicle(models.Model):
-    _inherit = ['mail.thread', 'mail.activity.mixin']
+    _inherit = ['mail.thread', 'mail.activity.mixin', 'avatar.mixin']
     _name = 'fleet.vehicle'
     _description = 'Vehicle'
     _order = 'license_plate asc, acquisition_date asc'

addons/fleet/models/fleet_vehicle_model.py

@@ -18,6 +18,7 @@ FUEL_TYPES = [
 
 class FleetVehicleModel(models.Model):
     _name = 'fleet.vehicle.model'
+    _inherit = ['avatar.mixin']
     _description = 'Model of a vehicle'
     _order = 'name asc'