On the log-addressing branch: Follow-up to r1509605.

* subversion/tests/libsvn_fs_fs/fs-pack-test.c
  (write_format): don't write duplicate lines to format files.

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/log-addressing@1509608 13f79535-47bb-0310-9956-ffa450edef68