logserver: Fix typo in port flag.
logserver: Fix typo in port flag.

It was changed from 8001 to 10115 by commit in
https://skia.googlesource.com/buildbot/+/4bac1fffb3bd4015fec5f0517c9c084b14085adb

BUG=None
TEST=None
R=jcgregorio@google.com

Review URL: https://codereview.chromium.org/652663007

Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot