[generator-react-server] Reference the correct file for the yeoman generator in package.json

[negativetwelve]

Hi there!

Instead of using the globally installed yeoman generator for this project, we're using a local version with yeoman-environment. When using the environment directly, we require this package in order to get a reference to the generator itself.

Unfortunately, the reference to the main in the package.json points to a file that doesn't exist. Everything seems to be fixed by fixing this one line :)

Let me know if this has any other implications. I don't think it should have any implications to the globally installed generator but I could be wrong.

[CLAassistant]

All committers have signed the CLA.

[gigabo]

Thanks @negativetwelve!