Remove wait_for_sidebar method

The method is not necessary because
animations are disabled during feature spec runs.

spec/support/helpers/board_helpers.rb

@@ -5,14 +5,5 @@ module BoardHelpers
     within card do
       first('.board-card-number').click
     end
-
-    wait_for_sidebar
-  end
-
-  def wait_for_sidebar
-    # loop until the CSS transition is complete
-    Timeout.timeout(0.5) do
-      loop until evaluate_script('$(".right-sidebar").outerWidth()') == 290
-    end
   end
 end