chore(ripple): fake mousedown test not running (#12865)

* With 4639a87 a new test has been introduced. Due to a wrong syntax the test does not run properly.

Author: devversion

src/lib/core/ripple/ripple.spec.ts

@@ -144,7 +144,7 @@ describe('MatRipple', () => {
       expect(rippleTarget.querySelectorAll('.mat-ripple-element').length).toBe(0);
     }));
 
-    it('should ignore fake mouse events from screen readers', () => fakeAsync(() => {
+    it('should ignore fake mouse events from screen readers', fakeAsync(() => {
       const event = createMouseEvent('mousedown');
       Object.defineProperty(event, 'buttons', {get: () => 0});