Quote filename when calling jupyter-load-file

Not quoting filenames causes the path to be misinterpreted if it contains spaces.

Author: moneylobster

jupyter-python.el

@@ -73,7 +73,7 @@ buffer."
        (t nil)))))
 
 (cl-defmethod jupyter-load-file-code (file &context (jupyter-lang python))
-  (concat "%run " file))
+  (concat "%run \"" file "\""))
 
 ;;; `jupyter-org'