Revert "Enable DemoMode for new QS clock"

This reverts commit 3ae456a8.

Reason for revert: DroidMonitor-triggered revert due to breakage https://android-build.googleplex.com/builds/tests/view?invocationId=I24700010105007478&testResultId=TR74428356555586938&tab=changes, bug b/257503854

BUG: 257503854
Change-Id: I141373bdb58451c25d132ff4a53965f698d0d572