Don't set location when recording already had

When marking a patient as having already had the vaccine, we shouldn't
be setting the location of the vaccination to the location of the
session as it's unlikely that the vaccination took place in that
session.

Author: thomasleese

app/controllers/patient_sessions/programmes_controller.rb

@@ -20,8 +20,8 @@ def record_already_vaccinated
     draft_vaccination_record.reset!
     draft_vaccination_record.update!(
       first_active_wizard_step: :confirm,
-      location: @session.location,
-      location_name: @session.clinic? ? "Unknown" : nil,
+      location: nil,
+      location_name: "Unknown",
       outcome: :already_had,
       patient: @patient,
       performed_at: Time.current,