Fix NotificationListener failed to receive events

This is a flaky test. In some legacy low end platform,when expand the notification panel, it may need more time for NotificationListener to receive events. Increasing SLEEP_TIME to 1000ms can avoid such failure.

Bug:182519713
Test: run cts -m CtsLegacyNotification29TestCases -t android.app.notification.legacy29.cts.NotificationAssistantServiceTest

Signed-off-by: qianyou <qianyou@xiaomi.com>
Change-Id: Ida48588b2b32382c041626d271d0e083b987fbfe
1 file changed