ceph-pr-commits: remove non-ascii char

ceph-pr-commits: remove non-ascii char

otherwise `jenkins-jobs test` fails when reading it in non-utf-8 locale,

Traceback (most recent call last):
  File "/tmp/venv.KVnqGXyZ3a/bin/jenkins-jobs", line 8, in <module>
    sys.exit(main())
  File "/tmp/venv.KVnqGXyZ3a/lib/python3.6/site-packages/jenkins_jobs/cli/entry.py", line 165, in main
    jjb.execute()
  File "/tmp/venv.KVnqGXyZ3a/lib/python3.6/site-packages/jenkins_jobs/cli/entry.py", line 146, in execute
    ext.obj.execute(self.options, self.jjb_config)
  File "/tmp/venv.KVnqGXyZ3a/lib/python3.6/site-packages/jenkins_jobs/cli/subcommand/test.py", line 66, in execute
    config_xml=options.config_xml)
  File "/tmp/venv.KVnqGXyZ3a/lib/python3.6/site-packages/jenkins_jobs/builder.py", line 279, in update_jobs
    output.write(job.output())
  File "/tmp/venv.KVnqGXyZ3a/lib/python3.6/codecs.py", line 836, in write
    return self.writer.write(data)
  File "/tmp/venv.KVnqGXyZ3a/lib/python3.6/codecs.py", line 376, in write
    data, consumed = self.encode(object, self.errors)
UnicodeEncodeError: 'latin-1' codec can't encode character '\u2014' in position 57823: ordinal not in range(256)

before this change:

$ iconv -f ascii -t ascii < ./ceph-pr-commits/build/build
...
input sequence at position 197

after this change,

$ iconv -f ascii -t ascii < ./ceph-pr-commits/build/build

finishes without issues.

Signed-off-by: Kefu Chai <kchai@redhat.com>