[FIX] crm: merge leads in multi-company

When merging leads with a company set different
than the current user company,
it failed because the notification email (the message
written in the thread summarizing the merge) couldn't
read the company name (the `name_get` call on the company)
because of the multi-company record rule.

`name_get` can be safely called as `sudo`, as it does
nothing else than returning the name of the record. This is
already done for the many2one links in the web client anyway
(You can see leads from a company different than yours,
you can see the company name to which the leads belongs to,
but you can't click on the company many2one link)

opw-677986

addons/crm/crm_lead.py

@@ -528,11 +528,11 @@ class crm_lead(format_address, osv.osv):
                 value = dict(key).get(lead[field_name], lead[field_name])
             elif field.type == 'many2one':
                 if lead[field_name]:
-                    value = lead[field_name].name_get()[0][1]
+                    value = lead[field_name].sudo().name_get()[0][1]
             elif field.type == 'many2many':
                 if lead[field_name]:
                     for val in lead[field_name]:
-                        field_value = val.name_get()[0][1]
+                        field_value = val.sudo().name_get()[0][1]
                         value += field_value + ","
             else:
                 value = lead[field_name]