pipeline:promote title cases app names

[gudmundur]

Using cli.styledHash title cases the keys, it makes things look weird:

$ heroku pipelines:promote -a gudmundur-github-app
...
Promotion successful
Gudmundur-Github-App-Prod: succeeded
Gudmundur-Github-Space:    succeeded

Related code:

heroku-pipelines/commands/pipelines/promote.js

Line 108 in 6531668

cli.styledHash(styledTargets);