Preserve the protocol for fanart images

(cherry picked from commit d8633b968830fd20d73612e9f0d0559b0bcb304c)

Closes #4145

frontend/src/Album/Details/AlbumDetails.js

@@ -39,11 +39,7 @@ const intermediateFontSize = parseInt(fonts.intermediateFontSize);
 const lineHeight = parseFloat(fonts.lineHeight);
 
 function getFanartUrl(images) {
-  const fanartImage = _.find(images, { coverType: 'fanart' });
-  if (fanartImage) {
-    // Remove protocol
-    return fanartImage.url.replace(/^https?:/, '');
-  }
+  return _.find(images, { coverType: 'fanart' })?.url;
 }
 
 function formatDuration(timeSpan) {

frontend/src/Artist/Details/ArtistDetails.js

@@ -44,11 +44,7 @@ const defaultFontSize = parseInt(fonts.defaultFontSize);
 const lineHeight = parseFloat(fonts.lineHeight);
 
 function getFanartUrl(images) {
-  const fanartImage = _.find(images, { coverType: 'fanart' });
-  if (fanartImage) {
-    // Remove protocol
-    return fanartImage.url.replace(/^https?:/, '');
-  }
+  return _.find(images, { coverType: 'fanart' })?.url;
 }
 
 function getExpandedState(newState) {