fix(calendar): set static true to calendar templates #5550

Author: nrobakova

projects/igniteui-angular/src/lib/calendar/calendar.component.ts

@@ -274,14 +274,14 @@ export class IgxCalendarComponent extends IgxMonthPickerBase implements AfterVie
     /**
      * @hidden
      */
-    @ContentChild(forwardRef(() => IgxCalendarHeaderTemplateDirective), { read: IgxCalendarHeaderTemplateDirective, static: false  })
+    @ContentChild(forwardRef(() => IgxCalendarHeaderTemplateDirective), { read: IgxCalendarHeaderTemplateDirective, static: true  })
     private headerTemplateDirective: IgxCalendarHeaderTemplateDirective;
 
     /**
      * @hidden
      */
     // tslint:disable-next-line:max-line-length
-    @ContentChild(forwardRef(() => IgxCalendarSubheaderTemplateDirective), { read: IgxCalendarSubheaderTemplateDirective, static: false  })
+    @ContentChild(forwardRef(() => IgxCalendarSubheaderTemplateDirective), { read: IgxCalendarSubheaderTemplateDirective, static: true  })
     private subheaderTemplateDirective: IgxCalendarSubheaderTemplateDirective;
 
     /**