fix(sample): Disable asyncRoutes for iOS in Expo configuration (#4702)

- Disabling the feature fixes expo/expo#35224

Author: krystofwoldrich

samples/expo/app.json

@@ -66,6 +66,7 @@
         {
           "asyncRoutes": {
             "web": true,
+            "ios": false,
             "default": "development"
           }
         }