spec: fix intermittant gb1 spec failures

Change-Id: Ie7299fde10b2d3e1953eac6101e31e4a8b08c3b9
Reviewed-on: https://gerrit.instructure.com/27609
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Bryan Madsen <bryan@instructure.com>
QA-Review: Bryan Madsen <bryan@instructure.com>
Product-Review: Bryan Madsen <bryan@instructure.com>

spec/selenium/gradebooks_spec.rb

@@ -65,6 +65,7 @@ describe "gradebook1" do
     click_option("#section-to-show", section_name)
     driver.execute_script("$('#section-to-show').parent().parent().find('button').click()")
     wait_for_ajaximations
+    sleep 2
   end
 
   it "should filter by section" do