Switch to toybox wc(1).

Test: treehugger
Change-Id: I14d22406c1a462d4075a8538e549a8d0f5b88e8d
diff --git a/ui/build/paths/config.go b/ui/build/paths/config.go
index b2d7a8a..1c0ee34 100644
--- a/ui/build/paths/config.go
+++ b/ui/build/paths/config.go
@@ -113,7 +113,6 @@
 	"timeout":   Allowed,
 	"tr":        Allowed,
 	"unzip":     Allowed,
-	"wc":        Allowed,
 	"which":     Allowed,
 	"xz":        Allowed,
 	"zip":       Allowed,
@@ -174,6 +173,7 @@
 	"uname":     Toybox,
 	"uniq":      Toybox,
 	"unix2dos":  Toybox,
+	"wc":        Toybox,
 	"whoami":    Toybox,
 	"xargs":     Toybox,
 	"xxd":       Toybox,