Move tail(1) to toybox.

Test: treehugger
Change-Id: If421513911208db4542c4767168ce50b7b837af8
diff --git a/ui/build/paths/config.go b/ui/build/paths/config.go
index 2e1dee5..d1d7c60 100644
--- a/ui/build/paths/config.go
+++ b/ui/build/paths/config.go
@@ -137,7 +137,6 @@
 	"sort":      Allowed,
 	"stat":      Allowed,
 	"tar":       Allowed,
-	"tail":      Allowed,
 	"tee":       Allowed,
 	"timeout":   Allowed,
 	"todos":     Allowed,
@@ -174,6 +173,7 @@
 	"id":     Toybox,
 	"od":     Toybox,
 	"sleep":  Toybox,
+	"tail":   Toybox,
 	"true":   Toybox,
 	"uname":  Toybox,
 	"uniq":   Toybox,