fix(CCalendar, CDatePicker, CDateRangePicker): calendar panels are removed when you click the year or month

Author: mrholek

js/src/calendar.js

@@ -204,15 +204,13 @@ class Calendar extends BaseComponent {
     EventHandler.on(this._element, 'click', '.btn-month', event => {
       event.preventDefault()
       this._view = 'months'
-      this._element.innerHTML = ''
-      this._createCalendarPanel()
+      this._updateCalendar()
     })
 
     EventHandler.on(this._element, 'click', '.btn-year', event => {
       event.preventDefault()
       this._view = 'years'
-      this._element.innerHTML = ''
-      this._createCalendarPanel()
+      this._updateCalendar()
     })
   }
 
@@ -406,7 +404,7 @@ class Calendar extends BaseComponent {
 
   _updateCalendar() {
     this._element.innerHTML = ''
-    this._createCalendarPanel()
+    this._createCalendar()
   }
 
   _dayClassNames(date, month) {