tests/unwrap-message-id.py

lint: fix failing code check

8d2b62d716b0 introduced code that `test-check-code.t` wasn't happy about, this
fixes it.

Differential Revision: https://phab.mercurial-scm.org/D10506

from __future__ import absolute_import, print_function

import sys

for line in sys.stdin:
    if line.lower() in ("message-id: \n", "in-reply-to: \n"):
        line = line[:-2]
    print(line, end="")