Fix copy codeblock when filesystem path includes real "http://" URL

[RRosio]

          It will be worth checking this with an "http://" real URL, because fsspec treats http/s as a special case, it doesn't remove the protocol specifier during _strip_protocol.

Originally posted by @martindurant in #130 (comment)

[RRosio]

We will return to this issue, to check how it stands after the recent updated to filesystem path handling.