Fix the image file that contains non-ascii character is not displayed

What does this MR do?

Unescaping the URI path in the path_type method.

Are there points in the code the reviewer needs to double check?

Nothing.

Why was this MR needed?

The image file that contains non-ascii character is not displayed.

ex) ![foo](<non-ascii filename>.png)

What are the relevant issue numbers / Feature requests?

Nothing.

Screenshots (if relevant)

Nothing.