[FIX] sale_quotation_builder: multi-company

- Create 2 companies A & B
- Set the website in A
- Set the user in both companies, main company being A
- Create a SO template in company B
- Click on "Design Template"

An AccessError is raised because:
- `slug` accesses the `display_name` of the template which is in company
  B
- the `allowed_company_ids` is set to company A in [1]

A solution could be to always set:
```
context['allowed_company_ids'] = request.env.user.company_ids.ids
```

But the side-effects could cause other issues.

Therefore, we handle the `slug` manually.

[1] https://github.com/odoo/odoo/blob/af411b866aa2052c01168342f8f05ae3dabad83e/addons/website/models/ir_http.py#L203

opw-2194103

closes odoo/odoo#47249

X-original-commit: 0bcfffd291aceb74a5260a49d2fa3032f511dba1
Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

addons/sale_quotation_builder/controllers/portal.py

@@ -3,12 +3,17 @@
 
 from odoo import http
 from odoo.http import request
+from odoo.addons.http_routing.models.ir_http import unslug
 from odoo.addons.portal.controllers.portal import CustomerPortal
 
 
 class CustomerPortal(CustomerPortal):
 
-    @http.route(["/sale_quotation_builder/template/<model('sale.order.template'):template>"], type='http', auth="user", website=True)
-    def sale_quotation_builder_template_view(self, template, **post):
+    @http.route(["/sale_quotation_builder/template/<string:template_id>"], type='http', auth="user", website=True)
+    def sale_quotation_builder_template_view(self, template_id, **post):
+        template_id = unslug(template_id)[-1]
+        template = request.env['sale.order.template'].browse(template_id).with_context(
+            allowed_company_ids=request.env.user.company_ids.ids,
+        )
         values = {'template': template}
         return request.render('sale_quotation_builder.so_template', values)