Correcting positioning of the ospos.css file

I wasn't aware of the need to build the project before css changes would take effect nor that I could just add `?debug=true` to the URL to see changes.  I've put the line back in its original position and it works without other changes.
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f