nightly-ptest.conf: Change name of artifacts
nightly-ptest.conf: Change name of artifacts

Now that we have the artifacts in the right place, we need to
rename them.

Signed-off-by: Beth Flanagan <86e3219095765dcc0f6f42aef4bd43803a05b796@intel.com>

denny820909/builder,denny820909/builder,denny820909/builder,denny820909/builder