fix(demo): Fix deployment of v4.2.x on appspot

Revert "fix(Demo): Fix deployment of codem-isoboxer in the Demo (#5257)"

This reverts commit 23d48d4.

package.json

@@ -67,7 +67,6 @@
     "demoDeps": [
       "awesomplete/awesomplete.css",
       "awesomplete/awesomplete.min.js",
-      "codem-isoboxer/dist/iso_boxer.min.js",
       "dialog-polyfill/dialog-polyfill.css",
       "dialog-polyfill/dist/dialog-polyfill.js",
       "eme-encryption-scheme-polyfill/index.js",