Passing scoped project name to `npm init just` should not result in nested folders

@ecraig12345 2019-02-21 01:23:39发表于 microsoft/just Type: Bug :bug::bug::bug:

When running npm init just, if I give the project a scoped name (such as @uifabric/dashboard), it makes nested folders.

Alternatively, if scoped project names aren't acceptable input, we should show an error instead of making nested folders.