fix(page-job-scheduler): corrige erro quando 'firstExecution' undefined

Corrigo erro quando 'firstExecution' é definido como undefined

fixes DTHFUI-10385

projects/templates/src/lib/components/po-page-job-scheduler/po-page-job-scheduler.service.spec.ts

@@ -808,17 +808,12 @@ describe('PoPageJobSchedulerService:', () => {
     });
 
     it(`replaceHourFirstExecution: should replace hour add time zone`, () => {
-      const initialDate = new Date(2025, 11, 24, 23, 59, 0);
-      const isoDate = initialDate.toISOString();
-      const stringDate = initialDate.toString();
-
-      const timeToReplace = '23:59';
+      const stringDate = new Date().toString();
       const timeZone = `${stringDate.substring(28, 31)}:${stringDate.substring(31, 33)}`;
-      const result = `2025-12-25T23:59:00${timeZone}`;
 
-      poPageJobSchedulerService['replaceHourFirstExecution'](isoDate, timeToReplace);
+      const result = `2025-12-24T23:59:00${timeZone}`;
 
-      expect(poPageJobSchedulerService['replaceHourFirstExecution'](isoDate, timeToReplace)).toBe(result);
+      expect(poPageJobSchedulerService['replaceHourFirstExecution']('2025-12-24', '23:59')).toBe(result);
     });
 
     it('returnValidExecutionParameter: should remove keys that have undefined value', () => {