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Revert HSv3 stats string formatting to its old %u self.
The rest of rephist.c is doing the same kind of unsigned casting. For example
see rep_hist_format_buffer_stats() and rep_hist_format_exit_stats().
The previous switch to %ld made Appveyor fail:
https://ci.appveyor.com/project/torproject/tor/builds/36118502