Fixed type check

Author: YulNaumenko

x-pack/plugins/triggers_actions_ui/public/application/sections/alert_details/components/alert_details.test.tsx

@@ -147,7 +147,7 @@ describe('alert_details', () => {
     const alert = mockAlert({
       executionStatus: {
         status: 'error',
-        date: new Date('2020-08-20T19:23:38Z'),
+        lastExecutionDate: new Date('2020-08-20T19:23:38Z'),
         error: {
           reason: 'unknown',
           message: 'test',