Revert "Fix Halo not showed at first notifiction drop"

This reverts commit 9823e6f58c32ca72698c266c977d2cb658b0bc28.
Revert "Halo: Add master switch to disable Halo (1/2)"

This reverts commit f86ce0fd993aa2aa8d2f67a88402aaf7559a71e4.