Update media_controls_lock_screen setting behavior

When the setting is disabled, hide the media carousel everywhere when
the device is on lockscreen, not just in the keyguard layout

Bug: 314333719
Test: manual
Test: atest MediaCarouselControllerTest
Flag: NONE

(cherry picked from commit f8371635)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:79af27be82294c31a161b61c1f853f9e59fa25a7)
Merged-In: I4f618e4013db894291e6fca9d49bceb1cb7e4bd9
Change-Id: I4f618e4013db894291e6fca9d49bceb1cb7e4bd9