Fix manage-booking time slots; align modify email with original

- getAvailableTimes() takes optional exclude_booking_id so a guest's
  own booking isn't counted as a conflict when editing — original time
  now reappears when extending services
- Manage-booking AJAX passes manage_token; server resolves to booking_id
- manage_booking_process uses the new param instead of the date-swap
  workaround (removes a small race-condition risk)
- Modify-booking emails (no/en/hu) now include Name/Email/Phone rows
  and the 24h cancellation policy, matching the original booking email

application/views/pages/manage-booking.php

@@ -562,7 +562,8 @@
                 action:        'getAvailableTimes',
                 worker_id:     $('#worker_id').val(),
                 servicelength: $('#servicelength').val(),
-                selectedDate:  selectedDate
+                selectedDate:  selectedDate,
+                manage_token:  '<?php echo $token; ?>'
             },
         }).done(function(result){
             if(result != 0){