[w3c/FileAPI] Remove Previous Version from .bs file (#169)

When publishing to WD the correct previous version gets added anyway, and having (an incorrect) previous version mentions in the .bs file actually breaks auto-publishing. 

This should fix `"Retrieved "previous" and "latest" documents, but their contents don't match.` errors from echidna.


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<a href="https://pr-preview.s3.amazonaws.com/w3c/FileAPI/pull/169.html" title="Last updated on Apr 21, 2021, 11:21 PM UTC (4a01382)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/FileAPI/169/dcff0c6...4a01382.html" title="Last updated on Apr 21, 2021, 11:21 PM UTC (4a01382)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/FileAPI/pull/169

-- Commit Summary --

  * Remove Previous Version from .bs file

-- File Changes --

    M index.bs (1)

-- Patch Links --

https://github.com/w3c/FileAPI/pull/169.patch
https://github.com/w3c/FileAPI/pull/169.diff

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