Revert "Stop the pinball engine from hijacking the browser tab's favicon"

This reverts commit 4dd6d60457.

lib/pinball/usePinballInstance.ts

@@ -61,32 +61,6 @@ export function usePinballInstance(
     const canvas = canvasRef.current;
     if (!canvas || !webgl2Supported) return;
 
-    // The engine sets a table-supplied image as the page favicon via a
-    // blob: URL (see vpinball.js's rel~='icon' link handling) — undesirable
-    // here, where the app's own favicon should stay put. Snapshot the
-    // current icon links up front and revert any blob: href the moment it
-    // appears, rather than patching the (compiled) engine itself.
-    const originalIconHrefs = new Map<HTMLLinkElement, string>();
-    document.querySelectorAll<HTMLLinkElement>("link[rel~='icon']").forEach((link) => {
-      originalIconHrefs.set(link, link.href);
-    });
-    const faviconObserver = new MutationObserver(() => {
-      document.querySelectorAll<HTMLLinkElement>("link[rel~='icon']").forEach((link) => {
-        if (!link.href.startsWith("blob:")) return;
-        const blobUrl = link.href;
-        const original = originalIconHrefs.get(link);
-        if (original) link.href = original;
-        else link.remove();
-        URL.revokeObjectURL(blobUrl);
-      });
-    });
-    faviconObserver.observe(document.head, {
-      childList: true,
-      subtree: true,
-      attributes: true,
-      attributeFilter: ["href"],
-    });
-
     setStatus("loading");
     const startedAt = performance.now();
 
@@ -129,7 +103,6 @@ export function usePinballInstance(
     })();
 
     return () => {
-      faviconObserver.disconnect();
       disposedRef.current = true;
       const instance = instanceRef.current;
       instanceRef.current = null;