Minor tweaks to svnauthz tests.

* subversion/tests/cmdline/svnauthz_tests.py
  (*): Fix a typo.
  (svnauthz_validate_txn_test, svnauthz_accessof_txn_test): Don't use a regex
    where it isn't needed.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1438686 13f79535-47bb-0310-9956-ffa450edef68