change path to webpack script

[s-oram]

I'm attempting to build the playground
project on Windows but have run into an error.

Running npm run build in the Playground project results in:

D:\dev-ie\auspost-kiosk\playground\node_modules\.bin\webpack:2
basedir=$(dirname "$(echo "$0" | sed -e 's,\\,/,g')")
          ^^^^^^^
SyntaxError: missing ) after argument list

The build fails after this error. It appears to be a
common error on Windows.

gotwarlost/istanbul#677
jestjs/jest#4751

There might be a few potential solutions.

This blog post suggested changing how Webpack is called.
https://www.programmersought.com/article/49215661254/

Quote:

The first type of packaging command is ./node_modules/.bin/webpack,
you can see that all the shell commands in the .bin directory are .cmd;

The second type of packaging command is ./node_modules/webpack/bin/webpack,
the last webpack is actually a js file, of course it supports node,
which also reflects the flexibility and omnipotence of the js language.