Process adb shell input keyevent 82 through dismiss

Previously, it would trigger a shade collapse, and eventually get
to keyguard to dismiss. Sending the request to keyguard follows
the path of every other dismiss request.

Bug: 371893850
Test: atest CtsWindowManagerDeviceKeyguard:android.server.wm.keyguard.KeyguardLockedTests
Flag: EXEMPT bugfix
Change-Id: I2c9a3ead9540ab473815e06d474d42978ff59cf6