flarum-cli asks to run yarn even when picking NPM

Even after selecting NPM with the cli confirming the selection

```
✔ JS Package Manager › NPM
```

it still asks to run yarn as the final step

```
✔ Run `yarn`? (recommended) … yes
```

`flarum-cli flarum info`:
```
Flarum version: 1.x
CLI version: 2.0.2
```

Start by reproducing the CLI flow for Flarum 1.x with CLI version 2.0.2, selecting NPM and observing the final command prompt. Trace the package-manager selection through the final run step; done means choosing NPM no longer asks to run yarn, with coverage for this selection if the existing test structure supports it.

Written by the indexing model from the issue text.