Update router assignment

Author: bertdeblock

files/tests/test-helper.__ext__

@@ -12,7 +12,7 @@ class Router extends EmberRouter {
 
 class TestApp extends EmberApp {
   modules = {
-    './router': { default: Router },
+    './router': Router,
     // add any custom services here
     // import.meta.glob('./services/*', { eager: true }),
   };