Switch to toybox chmod(1).

Test: treehugger
Change-Id: Iccb70941906d9cf8b004303a6935b7df1217babf
diff --git a/ui/build/paths/config.go b/ui/build/paths/config.go
index e2e4368..1bcbec1 100644
--- a/ui/build/paths/config.go
+++ b/ui/build/paths/config.go
@@ -78,7 +78,6 @@
 	"bash":      Allowed,
 	"bc":        Allowed,
 	"bzip2":     Allowed,
-	"chmod":     Allowed,
 	"cp":        Allowed,
 	"date":      Allowed,
 	"dd":        Allowed,
@@ -154,6 +153,7 @@
 	// On linux we'll use the toybox version of these instead
 	"basename": Toybox,
 	"cat":      Toybox,
+	"chmod":    Toybox,
 	"cmp":      Toybox,
 	"comm":     Toybox,
 	"cut":      Toybox,