Tryfix: Adjust test vector inspection to fix system tests
Created by: hacklschorsch
... that have started failing with https://github.com/tahoe-lafs/tahoe-lafs/pull/1127
Maybe this helps with https://whetstone.privatestorage.io/privatestorage/PrivateStorageio/-/issues/90#note_17133 But to be quite frank, IDK what I am doing here.
@tomprince is this useful?