erasure-code: dumpling-firefly-x/parallel/6-final-workload is incorrect

6-final-workload/ec-rados-plugin=jerasure-k=2-m=1.yaml was added to the
wrong directory.

Signed-off-by: Loic Dachary <loic-201408@dachary.org>
Merge pull request #204 from dachary/wip-spurious-erasure-code-workload

erasure-code: dumpling-firefly-x/parallel/6-final-workload is incorrect