semantex package file in wrong location

- [x] I have read the [MiKTeX Contributing Guidelines](https://github.com/MiKTeX/miktex-packaging/blob/master/CONTRIBUTING.md)

The file `stripsemantex.lua` which is part of the [`semantex`](https://www.ctan.org/pkg/semantex) package is placed in `.../source/semantex` where tex cannot find it.