Store: Environments import path is broken when generating new store

[brandonroberts]

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[x] Bug report  
[ ] Feature request
[ ] Documentation issue or request

What is the current behavior?

Expected behavior:

Minimal reproduction of the problem with instructions:

Generate a new project
Install @ngrx/store, @ngrx/store-devtools, @ngrx/schematics
Run ng generate @ngrx/schematics:store State --root -m app
Open the /src/app/reducers/index.ts file and note the broken import path for environments/environment

Version of affected browser(s),operating system(s), npm, node and ngrx:

Other information:

With the new project path structure, the project path is returned as /src/app. Since the environments directory is at the same level as app, the import is incorrect when using the project path to get the relative path to the reducers/index.ts file.