Revert "Add lock screen shortcut for opening glanceable hub"

This reverts commit 69d74b4e2c3bdf77fd8347d62cfbbfd29353513a.

Reason for revert: Rolling back experiment

Bug: 339667383
Test: N/A revert
Flag: EXEMPT revert
Change-Id: I7faf114693075c888132aefd052841618c34b45e
13 files changed