Follow-up to r1439592:

* tools/hook-scripts/mailer/mailer.py
  (main): Fix a copy-paste error in r1439592.

Patch by: Nick Peelman <nick@peelman.us>


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1447513 13f79535-47bb-0310-9956-ffa450edef68