test: files: skip test of error path on add
test: files: skip test of error path on add

Requires go-ipfs patch that is not yet released.
Please revert this commit when the cited commit makes it into the
release and the go-ipfs on buildbots for ipfsapi is updated.

alexander255/py-ipfs-api,ipfs/py-ipfs-api,ipfs/py-ipfs-api,alexander255/py-ipfs-api