Fix partial percent encoded links in markdown images

[hjiangsu]

Pull Request Description

This is a small PR which fixes an issue mentioned in the following post: https://lemmy.world/post/20288898. The reason why the image was failing to load properly was due to a partially encoded string.

Note: the markdown/image library that we use already handles encoding for URLs - this is a special case where the URL was only partially encoded.

The problematic string that was passed down to the markdown widget was https://upload.wikimedia.org/wikipedia/commons/4/44/Trať_u_osady_Luh_%28u_Bezpráví%29_1.jpg

• This is a partially encoded URL as %28 and %29 correspond to ( and ) respectively. However, all other non-ASCII characters were not percent-encoded

The fix here is to perform full decoding on the URL before passing it to our image library. The image library should automatically handle encoding!

Issue Being Fixed

Issue Number: N/A

Screenshots / Recordings

Before	After

Checklist

• If a new package was added, did you ensure it uses an appropriate license and is actively maintained?
• Did you use localized strings (and added appropriate descriptions) where applicable?
• Did you add semanticLabels where applicable for accessibility?

[micahmo]

Nice fix!