fix: fix bug

Author: sjbur

packages/devextreme/js/__internal/scheduler/appointment_popup/m_form.ts

@@ -940,7 +940,7 @@ export class AppointmentForm {
 
       repeatEditor.option('value', value);
       this._recurrenceForm.updateRecurrenceFormValues(
-        value,
+        value === repeatNeverValue ? '' : value,
         this.recurrenceRuleRaw,
         this.startDate,
       );

packages/devextreme/js/__internal/scheduler/appointment_popup/m_recurrence_form.ts

@@ -107,12 +107,12 @@ const weekDays = dateLocalization.getDayNames('abbreviated').map((dayName) => da
 const RECURRENCE_GROUP_NAME = 'recurrenceGroup';
 
 export class RecurrenceForm {
+  recurrenceRule: RecurrenceRule = new RecurrenceRule('', new Date());
+
   private readonly scheduler: any;
 
   private _dxForm?: dxForm;
 
-  private _recurrenceRule: RecurrenceRule = new RecurrenceRule('', new Date());
-
   private readonly weekDayItems: { text: string; key: string }[] = [];
 
   private _weekDayButtons: Record<string, dxButton> = {};
@@ -181,14 +181,6 @@ export class RecurrenceForm {
     this._readOnly = value;
   }
 
-  get recurrenceRule(): RecurrenceRule {
-    return this._recurrenceRule;
-  }
-
-  set recurrenceRule(value: RecurrenceRule) {
-    this._recurrenceRule = value;
-  }
-
   createRecurrenceFormGroup(): GroupItem {
     return {
       name: RECURRENCE_GROUP_NAME,