[FIX] website_mail(_channel): don't use self.env in controller

Without this, it will crash since self.env does not exists in a controller.
Using request will still crash later since `check_followers` does not exists.

Introduced with 957c99abd5

Found while working on task-2152191

closes odoo/odoo#42509

X-original-commit: 70e4a716feda7acb7385a98ac51ab40dabc3f50e
Signed-off-by: Romain Derie (rde) <rde@odoo.com>

addons/website_mail/controllers/main.py

@@ -18,7 +18,7 @@ class WebsiteMail(http.Controller):
             partner_ids = request.env.user.partner_id.ids
         else:
             # mail_thread method
-            partner_ids = [p.id for p in request.env['mail.thread'].sudo()._mail_find_partner_from_emails([email], records=record.sudo(), check_followers=True) if p]
+            partner_ids = [p.id for p in request.env['mail.thread'].sudo()._mail_find_partner_from_emails([email], records=record.sudo()) if p]
             if not partner_ids or not partner_ids[0]:
                 name = email.split('@')[0]
                 partner_ids = request.env['res.partner'].sudo().create({'name': name, 'email': email}).ids

addons/website_mail_channel/controllers/main.py

@@ -111,7 +111,7 @@ class MailGroup(http.Controller):
 
         else:
             # public users will recieve confirmation email
-            partner_ids = [p.id for p in self.env['mail.thread'].sudo()._mail_find_partner_from_emails([email], records=channel.sudo(), check_followers=True) if p]
+            partner_ids = [p.id for p in request.env['mail.thread'].sudo()._mail_find_partner_from_emails([email], records=channel.sudo()) if p]
             if not partner_ids or not partner_ids[0]:
                 name = email.split('@')[0]
                 partner_ids = [request.env['res.partner'].sudo().create({'name': name, 'email': email}).id]