Prevent glanceable hub quick affordance from showing in menus

This is just experimental at the moment, and should not show up in the
UI anywhere.

Bug: 339667383
Fix: 339667383
Test: verified the shortcut still shows up on Tangor
Flag: com.android.systemui.glanceable_hub_shortcut_button
Change-Id: I3beb24717ac953f088a7f279273c953bc28feb45