Remove no-op commit from an external test.

* subversion/tests/cmdline/externals_tests.py
  (update_deletes_file_external): Removing the commit, the preceeding change
    is done with URLs.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1615030 13f79535-47bb-0310-9956-ffa450edef68