Use normal btn size for test service

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/views/projects/services/_form.html.haml

@@ -42,4 +42,4 @@
     = f.submit 'Save', class: 'btn btn-save'
      
     - if @service.valid? && @service.activated? && @service.can_test?
-      = link_to 'Test settings', test_project_service_path(@project, @service.to_param), class: 'btn btn-small'
+      = link_to 'Test settings', test_project_service_path(@project, @service.to_param), class: 'btn'