statichttprepo: stop shadowing the `bytes` builtin
PyCharm flagged it, but I also misunderstood when looking at the code, because
the name implied a byte string, not a number.
$ echo "[extensions]" >> $HGRCPATH
$ echo "mq=" >> $HGRCPATH
$ hg init repo
$ cd repo
$ echo 'base' > base
$ hg ci -Ambase
adding base
$ hg qnew -mmqbase mqbase
$ hg qsave
$ hg qrestore 2
restoring status: hg patches saved state