bagger spill regression from 1f0ce7dc
Our `ocrd zip spill` is currently broken: it now has an option `dest` (no more `directory`) but the function has no parameter of that name. So click will always give you:

```TypeError: spill() got an unexpected keyword argument 'dest'```
diff --git a/ocrd/ocrd/cli/zip.py b/ocrd/ocrd/cli/zip.py
index b91aaf4e..561a4206 100644
--- a/ocrd/ocrd/cli/zip.py
+++ b/ocrd/ocrd/cli/zip.py
@@ -68,7 +68,7 @@ def bag(directory, mets_basename, dest, identifier, in_place, manifestation_dept
               help='Workspace folder location.',
               show_default=True)
 @click.argument('src', type=click.Path(dir_okay=False, readable=True, resolve_path=True), required=True)
-def spill(directory, src):
+def spill(dest, src):
     """
     Spill/unpack OCRD-ZIP bag at SRC to DEST
 
['ocrd/ocrd/cli/zip.py']