fix: return _getDefaultOptions

Author: sjbur

packages/devextreme/js/__internal/scheduler/header/m_header.ts

@@ -1,6 +1,7 @@
 import '@js/ui/drop_down_button';
 
 import registerComponent from '@js/core/component_registrator';
+import devices from '@js/core/devices';
 import errors from '@js/core/errors';
 import $ from '@js/core/renderer';
 import { getPathParts } from '@js/core/utils/data';
@@ -68,6 +69,12 @@ export class SchedulerHeader extends Widget<HeaderOptions> {
     };
   }
 
+  public _getDefaultOptions(): HeaderOptions {
+    return extend(super._getDefaultOptions(), {
+      _useShortDateFormat: !devices.real().generic || devices.isSimulator(),
+    }) as HeaderOptions;
+  }
+
   private _createEventMap(): void {
     this.eventMap = new Map([
       ['currentView', []],