Update repo2docker/buildpacks/julia/julia_project.py

Co-Authored-By: davidanthoff <anthoff@berkeley.edu>

repo2docker/buildpacks/julia/julia_project.py

@@ -64,7 +64,7 @@ class JuliaProjectTomlBuildPack(PythonBuildPack):
             ('JULIA_DEPOT_PATH', '${JULIA_PATH}/pkg'),
             ('JULIA_VERSION', self.julia_version),
             ('JUPYTER', '${NB_PYTHON_PREFIX}/bin/jupyter'),
-            ('JUPYTER_DATA_DIR', '${APP_BASE}/conda/share/jupyter')
+            ('JUPYTER_DATA_DIR', '${NB_PYTHON_PREFIX}/share/jupyter'),
         ]
 
     def get_path(self):