Hide UMO from the shade when QS is disabled

With the flexiglass off UMO is not visible in the Shade. This CL
replicates this behaviour when flexiglass on

Flag: com.android.systemui.scene_container
Bug: 371545613
Test: manually. Start playing music and observe UMO absence in the Shade. The commands used are:
$ adb shell cmd statusbar send-disable-flag quick-settings
$ adb shell cmd statusbar send-disable-flag none

Change-Id: Id677504f982abad7d1d1cec9e0a2d5a19882546e