vfs: fix virtual entries leak in removed directory

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Deleting the contents of a directory and then the directory itself,
before a listing has confirmed the deletes, left the directory's
virtual entries behind. They are counted in every parent directory, and
a directory which counts virtual entries refuses to forget its cache, so
vfs/forget could not make changes made outside rclone visible.

This lasted until the removed directory's own cleanup timer purged its
entries, which happens 2 x --dir-cache-time later.

This fix drops the removed directory's virtual entries once it has been
removed.

Fixes #10083

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