Move sleep(1) to toybox.

Test: clean build
Change-Id: I724278466c4d1367add79f949d1869e1e50a192d
diff --git a/ui/build/paths/config.go b/ui/build/paths/config.go
index 4034533..555dd1c 100644
--- a/ui/build/paths/config.go
+++ b/ui/build/paths/config.go
@@ -137,7 +137,6 @@
 	"sha1sum":   Allowed,
 	"sha256sum": Allowed,
 	"sha512sum": Allowed,
-	"sleep":     Allowed,
 	"sort":      Allowed,
 	"stat":      Allowed,
 	"tar":       Allowed,
@@ -174,6 +173,7 @@
 	// On linux we'll use the toybox version of these instead
 	"cat":    Toybox,
 	"id":     Toybox,
+	"sleep":  Toybox,
 	"true":   Toybox,
 	"uname":  Toybox,
 	"uniq":   Toybox,