[WICG/directory-upload] Rename Suggested User Interface Element Text to "Choose folders" (#39)

The [suggested user interface element text](https://wicg.github.io/directory-upload/proposal.html#dfn-distinct-file-and-directory-pickers) is "Choose directories". However, most users are familiar with the term "folder", not with "directory", so it should be renamed.

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https://github.com/WICG/directory-upload/issues/39