Remove the package-lock.json from the Zip file downloaded by the scene Builder

[cazala]

It is like a billion years old and it lacks lots of stuff, and it causes the npm install to install outdated stuff, and then the dcl start does not work.

We should remove the package-lock.json and leave only the package.json that is already included, that's enough for the project to be run, no need for the package-lock.