Move pwd(1) to toybox.

Test: treehugger
Change-Id: I656e322724d13273bf1099c6cc311a520aa4173e
diff --git a/ui/build/paths/config.go b/ui/build/paths/config.go
index d1d7c60..5e68db8 100644
--- a/ui/build/paths/config.go
+++ b/ui/build/paths/config.go
@@ -119,7 +119,6 @@
 	"pkill":     Allowed,
 	"ps":        Allowed,
 	"pstree":    Allowed,
-	"pwd":       Allowed,
 	"python":    Allowed,
 	"python2.7": Allowed,
 	"python3":   Allowed,
@@ -172,6 +171,7 @@
 	"env":    Toybox,
 	"id":     Toybox,
 	"od":     Toybox,
+	"pwd":    Toybox,
 	"sleep":  Toybox,
 	"tail":   Toybox,
 	"true":   Toybox,