app_chanspy: Fix a test that was failing on account of r413551

ASTERISK-23381 #close
ASTERISK-23381 #comment Reported by: Robert Moss
Review: https://reviewboard.asterisk.org/r/3505/


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/11@413710 f38db490-d61c-443f-a65b-d21fe96a405b