When clearing dive file data, forget the saved git sha

Otherwise parse_file() thinks that this data has already been loaded and
doesn't re-read it, even though our internal data structures have been
erased - so a subsequent parse_file after clear_dive_file_data() that
opens the same git repository finishes successfully, but leaves the
dive_table empty which is of course incorrect.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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