[National Highways] Fix 'base_url_for_report'.

Was defaulting to always using the cobrand URL, even for reports not belonging to
National Highways.

https://mysocietysupport.freshdesk.com/a/tickets/5062

perllib/FixMyStreet/Cobrand/HighwaysEngland.pm

@@ -53,6 +53,8 @@ sub base_url { FixMyStreet::Cobrand::UKCouncils::base_url($_[0]) }
 sub contact_name { FixMyStreet::Cobrand::UKCouncils::contact_name($_[0]) }
 sub contact_email { FixMyStreet::Cobrand::UKCouncils::contact_email($_[0]) }
 sub users_staff_admin { FixMyStreet::Cobrand::UKCouncils::users_staff_admin($_[0]) }
+sub base_url_for_report { FixMyStreet::Cobrand::UKCouncils::base_url_for_report($_[0], $_[1]) }
+sub owns_problem { FixMyStreet::Cobrand::UKCouncils::owns_problem($_[0], $_[1]) }
 
 =item * Any report made when the site was only fully anonymous should remain anonymous