fix(Calendar): fixed initialization error when value[] is combined with switch-mode (#4005)

Author: anlyyao

packages/components/calendar/calendar.ts

@@ -104,7 +104,7 @@ export default class Calendar extends SuperComponent {
     value(v) {
       this.base.value = v;
       this.calcMonths();
-      this.updateCurrentMonth(v);
+      this.updateCurrentMonth(Array.isArray(v) ? v[0] : v);
     },
 
     visible(v) {