output_processors/postgres: Fix incorrect parameter
output_processors/postgres: Fix incorrect parameter

When verifying the database schema the connection instead of a cursor
should be passed.

setrofim/workload-automation,setrofim/workload-automation,setrofim/workload-automation,ARM-software/workload-automation,ARM-software/workload-automation,setrofim/workload-automation,ARM-software/workload-automation,ARM-software/workload-automation