Update validation test for the new policy

```
Error: fully scope test system calls, e.g. system "#{bin}/carton"
```

Closes #9.

Signed-off-by: Jed Fox <[email protected]>
Signed-off-by: Yuta Saito <[email protected]>

Author: kateinoigakukun

carton.rb

@@ -28,6 +28,6 @@ def install
   end
 
   test do
-    system "carton", "-h"
+    system "#{bin}/carton", "-h"
   end
 end