py3: add b'' prefixes to tests/test-status-inprocess.py
# skip-blame because just b'' prefixes
Differential Revision: https://phab.mercurial-scm.org/D3321
$ echo "[extensions]" >> $HGRCPATH
$ echo "mq=" >> $HGRCPATH
$ hg init
$ echo 'base' > base
$ hg ci -Ambase
adding base
$ hg qnew -mmqbase mqbase
$ hg qsave
$ hg qrestore 2
restoring status: hg patches saved state