tests/test-bad-pull.t

tests: use `testrepohg` in one more place in test-check-code.t

This is already used elsewhere in the test to access the current hg repo, and
avoids an error about the unknown `revlog-compression-zstd` when C extensions
aren't built.  The only other such error is in test-check-interfaces.py, but I
don't see a way to avoid it other than to create an empty scratch repo.

Differential Revision: https://phab.mercurial-scm.org/D9364

#require serve

  $ hg clone http://localhost:$HGPORT/ copy
  abort: * (glob)
  [100]

  $ test -d copy
  [1]

  $ "$PYTHON" "$TESTDIR/dumbhttp.py" -p $HGPORT --pid dumb.pid
  $ cat dumb.pid >> $DAEMON_PIDS
  $ hg clone http://localhost:$HGPORT/foo copy2
  abort: HTTP Error 404: * (glob)
  [100]
  $ killdaemons.py