Move Metadata.json to output folder if output folder is unspecified

Summary

If the output folder is not specified, the metadata.json is created in the current working directory, instead of the created output folder.

Environment

1. FAME-Io version: 3.5.0

Steps to reproduce

1. convertFameResults without specifying the output folder (and not suppressing metadata)

Expected result:

metadata.json should be created in the newly create output folder

Actual result:

metadata.json is created in the current wordking directory.