fix migration - remove duplicate foreign key

db/migrate/20220720214646_add_delete_cascade_from_orgs_down.rb

@@ -1,6 +1,7 @@
 class AddDeleteCascadeFromOrgsDown < ActiveRecord::Migration[7.0]
   def up
     add_foreign_key :schemes, :organisations, column: "owning_organisation_id", on_delete: :cascade
+  
   end
 
   def down