test(ngSanitize): disable a failing Edge test in all versions, including 18

It's been only disabled on Edge 16/17 so far which made it fail in Edge 18.

Closes #16786

test/ngSanitize/sanitizeSpec.js

@@ -261,8 +261,8 @@ describe('HTML', function() {
       });
     });
 
-    if (!/Edge\/(16|17)/.test(window.navigator.userAgent)) {
-      // Skip test on Edge 16 due to browser bug.
+    if (!/Edge\/\d{2,}/.test(window.navigator.userAgent)) {
+      // Skip test on Edge due to a browser bug.
       it('should throw on a form with an input named "nextSibling"', function() {
         inject(function($sanitize) {