QA: Page Issues browser test should wait till JS has finished loading

Clicking the page issue banner (which is ready from first paint to
be clicked) will not yield the overlay. The user must wait for the JS
to load. Likely the reason for Minerva browser test failures against
beta cluster.

Change-Id: I06c488ca64dd44ad24368a1d6b47bb2646ad4552

tests/browser/features/step_definitions/issues_steps.rb

@@ -15,6 +15,7 @@ When(/^this page has issues$/) do
 end
 
 Then(/^I should not see the issues overlay$/) do
+  on(ArticlePage).wait_until_rl_module_ready('skins.minerva.scripts')
   expect(on(ArticlePage).overlay_element).not_to be_visible
 end