vfs: fix writing to a read only directory creating spurious directory entries

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Before this fix, when a write to a read only directory failed, rclone
would leav spurious directory entries in the directory.

This confuses `rclone serve webdav` into giving this error

    http: superfluous response.WriteHeader

This fixes the VFS layer to remove any directory entries where the
file creation did not succeed.

Fixes #5702

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500 Internal Server Error

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