fix #858 DatePicker - can not pick date that is not in current month/year

Author: vegegoku

domino-ui/src/main/java/org/dominokit/domino/ui/datepicker/Calendar.java

@@ -137,6 +137,7 @@ public Calendar(Date date, DateTimeFormatInfo dateTimeFormatInfo, CalendarInitCo
           onDateViewUpdate(updatedDate);
           calendarMonth.show();
           yearMonthPicker.hide();
+          this.date = updatedDate;
         });
 
     this.root.addEventListener(