webview: Update `generatedEs3.js` to match `js.js`.
webview: Update `generatedEs3.js` to match `js.js`.

Commit 466329641 updated the file `js.js` but forgot to rebuild the
generated file.  Caught by our CI.

vishwesh3/zulip-mobile,vishwesh3/zulip-mobile,vishwesh3/zulip-mobile,vishwesh3/zulip-mobile