BUGFIX: Artist page doesn't decode URL fields (#18)

* BUGFIX: Artist page doesn't decode URL fields

The frontend url-encodes ID3 tags to safely use them in URLs.
So the artist page for "The Beatles" is `/web/artist/The%20Beatles`.
For encoded fields with non-trivial characters (comma, ampersand),
the browser or url router won't automatically decode those values.
So `Emerson, Lake & Palmer` (`Emerson%2C%20Lake%20%26%20Palmer`)
ended up as `Emerson%2C Lake %26 Palmer` in the frontend memory,
which will match with nothing when searched for in MPD.

The fix is to include a decode step in the render step of the
Artist page so that it queries the MPD backend with the correct
value.

* spaces

* whoops

Author: aspage2

web/src/ArtistPage/Component.js

@@ -8,7 +8,8 @@ import { albumListFromData } from "../mpd";
 import urls from "../urls";
 
 export default function ArtistPage(props) {
-  const { artist, history } = props;
+  const { artist: artistUnDecoded, history } = props;
+  const artist = decodeURIComponent(artistUnDecoded);
   const { data, loaded, err } = useMPDQuery(`find albumartist "${artist}"`);
   const [show, _] = React.useState(false);