QPID-5732: Perl examples getting the wrong cmdline arguments

The hello_world and map_receiver examples had a one-off error when
getting command line arguments. This patch points them back to the
correct arguments.

Contributed by Zdenek Kraus <zkraus@redhat.com>

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1591006 13f79535-47bb-0310-9956-ffa450edef68