fix: wasm-pack bin script entry

[ahippler]

A bin entry in a package.json has to be a local file and not a command to be linked by a package manager.

See https://docs.npmjs.com/cli/v9/configuring-npm/package-json#bin

To use this, supply a bin field in your package.json which is a map of command name to local file name.

this fixes #1248

[ahippler]

@drager could you please review and make a new release?

[drager]

Thanks!