Merge "[Thread] use dedicated flag for Thread settings" into main am: 33722b512a

Original change: https://android-review.googlesource.com/c/platform/packages/apps/Settings/+/3002558

Change-Id: Ib9b4e1dde74dd45f93771ead002fa3bd830ca49c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>