Do no redact emergency notifications

notifications from emergency assistance package should not be
hidden/redacted by the screen share protection feature

Bug: 332905289
Test: atest SensitiveNotificationProtectionControllerTest
Flag: ACONFIG com.android.systemui.screenshare_notification_hiding_bug_fix TRUNK_STAGING
Change-Id: Iece9b7b262a578a847e4b2dfa11074595dacbf45