Resolve "Company edit page cancel button is broken"

Closes #479 (closed)

app/views/companies/_form.html.erb

@@ -65,5 +65,5 @@
         ) %>
   </div>
   <%= f.submit value: "#{f.object.new_record? ? 'Create' : 'Update'} #{company_name.capitalize}", class: 'btn btn-primary' %>
-  <%= link_to 'Cancel', url_for(company), class: 'btn btn-default' unless no_cancel %>
+  <%= link_to 'Cancel', f.object.new_record? ? companies_url : offerer_url(company.acting_as), class: 'btn btn-default' unless no_cancel %>
 <% end %>