[FIX] website_crm: fix medium_id for website sent form

In ddac26cd `crm.crm_medium_website` was replaced by
`utm.utm_medium_website`.

There was one place where it was not reverberated so the medium_id was
always unset in that instance (a crm.lead created from a website form).

opw-668853

note: no need to forward port after saas-6 (code change)

addons/website_crm/controllers/main.py

@@ -60,7 +60,7 @@ class contactus(http.Controller):
         post_description = []  # Info to add after the message
         values = {}
 
-        values['medium_id'] = request.registry['ir.model.data'].xmlid_to_res_id(request.cr, SUPERUSER_ID, 'crm.crm_medium_website')
+        values['medium_id'] = request.registry['ir.model.data'].xmlid_to_res_id(request.cr, SUPERUSER_ID, 'utm.utm_medium_website')
         values['team_id'] = request.registry['ir.model.data'].xmlid_to_res_id(request.cr, SUPERUSER_ID, 'website.salesteam_website_sales')
 
         for field_name, field_value in kwargs.items():