Include lua/module/sample.svg in hackage tarball

Should fix the following error when running tests from Hackage tarball:

```
    pandoc.mediabag:                            [WARNING] Could not fetch resource lua/module/sample.svg: replacing image with description
FAIL
      fetch // populates media bag:
      File lua/module/sample.svg not found in resource path
DEBUG:root:haskell-pandoc-lua-engine:
      fill // populates media bag:
      lua/module/pandoc-mediabag.lua:70:
      expected values to be equal, got 'nil' and 'image/svg+xml'
```

0 files changed, 0 insertions, 0 deletions