Fix flaky calendar spec by clicking the same cell again

We recently added more tabs which pushed the tabs to the left
and meant the Overview tab is obscured by a tooltip.
So instead we now click, then wait, then click the same cell again
Unsure if it's actually supposed to behave like this, but it does

spec/features/calendar_spec.rb

@@ -113,8 +113,8 @@ RSpec.describe 'Contributions Calendar', :js do
       describe 'deselect calendar day' do
         before do
           cells[0].click
-          page.find('.js-overview-tab a').click
           wait_for_requests
+          cells[0].click
         end
 
         it 'hides calendar day activities' do