Fix hub lockscreen shortcut showing up before first unlock

isCommunalAvailable also takes into consideration settings state for
the glanceable hub ("Widgets on lock screen")

Fixes: 383183096
Test: atest GlanceableHubQuickAffordanceConfigTest
      also verified manually on device
Flag: com.android.systemui.glanceable_hub_v2
Change-Id: I56840bf9344010aaa1ceb96bb6d8c2df7557b88d