Fix publishing entry feature spec

Apparently the date picker overlay now opens to the top, hiding the
header that we were trying to click to blur the input. Hit tab key
instead to blur.

spec/support/dominos/editor/publish_entry_panel.rb

@@ -20,7 +20,7 @@ def set_depublication_date(date, time)
         node.find('input[name=publish_until_time]').set(time)
 
         # capybara doesn't hide the datepicker overlay properly
-        blur_input_fields
+        blur_date_field
       end
 
       def save
@@ -53,10 +53,8 @@ def wait_for_save_to_finish
         node.has_selector?('.publish_entry.published')
       end
 
-      def blur_input_fields
-        node.find('h2').click
-        # Wait for date drop down to fade out
-        sleep 1
+      def blur_date_field
+        node.find('input[name=publish_until]').native.send_keys(:tab)
       end
     end
   end