[bug:] dfx new --no-frontend generates an unused <proj-name>_assets folder and canister.

[crusso]

Nit: dfx new --no-frontend generates an unused _assets folder and canister.

crusso@vm:~/random_maze$ dfx --version
dfx 0.7.0-beta.6
crusso@vm:~$ dfx new --no-frontend random_maze
Fetching manifest https://sdk.dfinity.org/manifest.json
Creating new project "random_maze"...
crusso@vm:~$ tree random_maze/
random_maze/
├── dfx.json
├── README.md
└── src
    ├── random_maze
    │   └── main.mo
    └── random_maze_assets
        └── assets
            └── sample-asset.txt
4 directories, 4 files