[FIX] l10n_co: commercial_partner_country_id no longer exists

Removed by b341b5ca73. This function
copied the check_vat constrains decorator before that commit. Instead
replace with country_id because the l10n_co check_vat function still
uses that field.

addons/l10n_co/models/res_partner.py

@@ -45,7 +45,7 @@ class ResPartner(models.Model):
             except ValueError:
                 partner.l10n_co_verification_code = False
 
-    @api.constrains('vat', 'commercial_partner_country_id', 'l10n_co_document_type')
+    @api.constrains('vat', 'country_id', 'l10n_co_document_type')
     def check_vat(self):
         # check_vat is implemented by base_vat which this localization
         # doesn't directly depend on. It is however automatically