Make `npm install` respect `config.unicode`

Before:
```
~/Code/npm/test/tap/install-cli$ npm install --unicode false
npm http GET https://registry.npmjs.org/read/1.0.5
npm http 304 https://registry.npmjs.org/read/1.0.5
npm http GET https://registry.npmjs.org/mute-stream
npm http 304 https://registry.npmjs.org/mute-stream
read@1.0.5 node_modules/read
└── mute-stream@0.0.4
```

After:
```
~/Code/npm/test/tap/install-cli$ node ../../../bin/npm-cli.js install read@1.0.5 --unicode false
npm http GET https://registry.npmjs.org/read
npm http 304 https://registry.npmjs.org/read
npm http GET https://registry.npmjs.org/mute-stream
npm http 304 https://registry.npmjs.org/mute-stream
read@1.0.5 node_modules/read
`-- mute-stream@0.0.4
```

Fixes #4358.