The schedule takes you to the current day and time

The schedule takes you to the current day and time in case that the current date belongs to the conference schedule.

Closes https://github.com/openSUSE/osem/issues/1057

app/views/conference/_carousel.html.haml

@@ -9,7 +9,7 @@
   .carousel-inner
     - start_time = DateTime.parse("#{date} #{@conf_start}:00")
     - (0..carousel_number-1).each do |number|
-      %div{ class: "item #{ number == 0 ? 'active first' : ( number == carousel_number-1 ? 'last' : '') }" }
+      %div{ class: "#{ carousel_item_class(number, carousel_number, number_columns, @hour_column)}" }
         %table.table.table-bordered.schedule-table#schedule
           %tr
             %th