Fix commit 179424db: No test file or result files should be executable

In commit 179424db the file lowercase_table2.result was made executable
for no known reason, most likely just a mistake. Test result files
definitely should not be executable.

All new code of the whole pull request, including one or several files
that are either new files or modified ones, are contributed under the
BSD-new license. I am contributing on behalf of my employer Amazon Web
Services, Inc.