chore: bizhawk app icon, minui initials

BizHawk's tile takes EmuHawk's application icon (ApplicationIcon in its csproj) instead of an account avatar. MinUI has no logo of its own: its entry and copy go, and fetch_site_images.py now removes the copy of a platform without a logo.

scripts/fetch_site_images.py

@@ -139,6 +139,10 @@ def fetch_logos() -> None:
     for name, entry in sorted(platforms.items()):
         url = entry.get("logo")
         if not url:
+            # No logo of its own: the tile shows initials, and an old copy
+            # would still be served.
+            for stale in LOGO_DIR.glob(f"{name}.*"):
+                stale.unlink()
             continue
         download = f"{url}?s={LOGO_SIZE * 2}" if AVATAR_HOST in url else url
         data = fetch(download)