test: Remove unused sinon afterEach cleanup

sinon.restore() in afterEach was only needed for the window.location stub
which was removed. The remaining sinon.spy (scrollTo) is restored manually.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: sbesh91

test/router.test.js

@@ -40,11 +40,6 @@ describe('Router', () => {
 		document.body.appendChild(scratch);
 		history.replaceState(null, null, '/');
 	});
-	
-	afterEach(() => {
-	  sinon.restore();
-	});
-
 
 	it('should throw a clear error if the LocationProvider is missing', () => {
 		const Home = () => <h1>Home</h1>;