ocrd workspace find --download does not use correct workspace prefix
There is a flaw in the workspace directory resolution of the CLI:

    ocrd workspace -d Brsfded_39946221X-18920413 find -G ORIGINAL --download

This will:

- change remote links in `Brsfded_39946221X-18920413/mets.xml` to local ones, now pointing to `ORIGINAL/*`
- download the files under `Brsfded_39946221X-18920413/Brsfded_39946221X-18920413/ORIGINAL` (one level too deep)

diff --git a/ocrd/ocrd/cli/workspace.py b/ocrd/ocrd/cli/workspace.py
index bd4011c2..908f55b3 100644
--- a/ocrd/ocrd/cli/workspace.py
+++ b/ocrd/ocrd/cli/workspace.py
@@ -31,6 +31,7 @@ class WorkspaceCtx():
                 raise ValueError("--mets is an http(s) URL but no --directory was given")
             directory = dirname(abspath(mets_url)) or getcwd()
         elif directory and not mets_url:
+            directory = abspath(directory)
             mets_url = join(directory, mets_basename)
         else:
             directory = getcwd()
['ocrd/ocrd/cli/workspace.py']