Decode url-encoded slug before comparing (#157)

Tumblr allows for slugs that contain non url safe characters
meaning that they will get URL encoded. However, when we compare
the given slug against the post's actual slug a correct slug will
return a false equality check due to it being URL encoded.

Thus we need to decode the url before comparing

src/routes/blogs/post.py

@@ -27,6 +27,8 @@ async def before_blog_post_request(request):
 
     # Check if slug is passed
     if slug := request.match_info.get("slug"):
+        slug = urllib.parse.unquote(slug)
+
         # Redirect to the correct slug if the given slug does not match the post's slug
         if slug != post.slug:
             # Unless of course the post doesn't have a slug in the first place in which