Clear the "hasSensitiveContent" bit if connected to Wifi

When sending notifications to the SystemUi that have the
"hasSensitiveContent" bit set, if the device is connected to wifi, clear
the bit. We don't want system UI redacting the notification content
(absent other redaction rules) based on OTPs if connected to wifi.

Test: atest NotificationManagerServiceTest
Flag: android.app.redact_sensitive_content_notifications_on_lockscreen
Bug: 358403414
Change-Id: Ia337ca546f921e322dbe12c7a7ca1b57ed6242ad