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 MediaHierarchyManagerTest
Flag: NONE
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:a441f4acd62cce1059818ce8e9b7ab93b0079e50)
Merged-In: I4f618e4013db894291e6fca9d49bceb1cb7e4bd9
Change-Id: I4f618e4013db894291e6fca9d49bceb1cb7e4bd9