When inspecting plugin stylesheet bundles in production, they contain styles from core even though plugin does not use them and does not import them.

Steps to reproduce:
1) Go to page that uses plugin stylesheets from webpack (Hosts -> New with foreman_ansible plugin, Monitor -> Tasks)
2) Inspect the source of the css bundle

In development, the styles are pulled in as well, but it is more difficult to see as developer tools will point directly to the file from core.