Fix nbextension datafile path

Author: vidartf

setup.py

@@ -31,9 +31,9 @@
     'js',
     data_files_spec=[
         ('share/jupyter/nbextensions/jupyter-threejs',
-         name, 'static/*.js'),
+         name + '/static', '*.js'),
         ('share/jupyter/nbextensions/jupyter-threejs',
-         name, 'static/*.js.map'),
+         name + '/static', '*.js.map'),
         ('share/jupyter/lab/extensions',
          'js/lab-dist', 'jupyter-threejs-*.tgz'),
     ],