Revert "feat: Deezer artist photo fallback for local artists with no Navidrome image"

This reverts commit 569af968c5.

public/sw.js

@@ -1,4 +1,4 @@
-const CACHE = 'ns-v56';
+const CACHE = 'ns-v55';
 const PRECACHE = ['/', 'index.html', 'manifest.json', 'icon.svg'];
 const SKIP_PATHS = ['/rest/stream', '/rest/download', '/config.js'];
 // Auth token params stripped from cache keys so artwork survives across sessions/token refreshes.