deposit: fix JSONSchema dependency paths
deposit: fix JSONSchema dependency paths

* FIX Adds the right paths to `uft8` and `base64` plugins.

Signed-off-by: Harris Tzovanakis <b1c1d8736f20db3fb6c1c66bb1455ed43909f0d8@drjova.com>

inveniosoftware/invenio-deposit,inveniosoftware/invenio-deposit,inveniosoftware/invenio-deposit,inveniosoftware/invenio-deposit