add exit to foodfite script

xtrn/3rdp-install/foodfite-wilson.js

@@ -27,4 +27,6 @@ if (!file.open("w")) {
   exit(1)
 }
 file.writeAll(lines);
-file.close();
\ No newline at end of file
+file.close();
+
+exit(0);
\ No newline at end of file