tests: update test-releasenotes-formatting.t output
The output seems to be left outdated because running this test requires
fuzzy-wuzzy which is not generally installed.
Differential Revision: https://phab.mercurial-scm.org/D7723
from __future__ import absolute_import, print_function
import re
import sys
print(re.sub(r"(?<=Message-Id:) \n ", " ", sys.stdin.read()), end="")