app.css is in dist folder once with and once without fingerprint

[mydea]

I noticed that when building with embroider, the main app.css will be in the dist folder twice after building, once without and once with fingerprint.

To reproduce:

1. Checkout https://github.com/mydea/ember-issue-reproductions/tree/fn/embroider-app-css
2. Run yarn && ember b --prod
3. Look into dist/assets, you'll find both ember-issue-reproductions.css as well as ember-issue-reproductions.xxxxx.css

The non-fingerprinted one seems to be non-minimized, too, so I would guess it is somehow left over in the processing of the file.

[bertdeblock]

I can confirm this issue, I've noticed this as well.