Fix failures in default sort order spec

Test cases were not waiting for page load after clicking.
This caused failures in test cases that were executed right after
these incorrect ones, because of requests hitting server after
a test was finished.
We do not have to click links, we can go directly to a correct page
by passing parameters in the URL.

spec/features/issuables/default_sort_order_spec.rb

@@ -180,16 +180,10 @@ describe 'Projects > Issuables > Default sort order', feature: true do
   end
   def visit_merge_requests_with_state(project, state)
-    visit_merge_requests project
-    visit_issuables_with_state state
+    visit_merge_requests project, state: state
   end
   def visit_issues_with_state(project, state)
-    visit_issues project
-    visit_issuables_with_state state
-  end
-
-  def visit_issuables_with_state(state)
-    within('.issues-state-filters') { find("span", text: state.titleize).click }
+    visit_issues project, state: state
   end
 end