test: update Modernizir expectations (#32308)

Looks like `hiddenscroll` was different when an external monitor was
connected.

tests/assets/modernizr/safari-18.json

@@ -230,7 +230,7 @@
   "fullscreen": true,
   "gamepads": true,
   "geolocation": true,
-  "hiddenscroll": false,
+  "hiddenscroll": true,
   "history": true,
   "htmlimports": false,
   "ie8compat": false,

tests/library/modernizr.spec.ts

@@ -39,7 +39,6 @@ it('Safari Desktop', async ({ browser, browserName, platform, server, headless,
   const { actual, expected } = await checkFeatures('safari-18', context, server);
 
   expected.pushmanager = false;
-  expected.hiddenscroll = true;
   expected.devicemotion2 = false;
   expected.devicemotion = false;
   expected.deviceorientation = false;