chore: use warn for async boot condition

Author: NathanWalker

packages/angular/src/lib/application.ts

@@ -258,7 +258,7 @@ export function runNativeScriptAngularApp<T, K>(options: AppRunOptions<T, K>) {
             }
           };
         } else {
-          NativeScriptDebug.bootstrapLog('App is bootstrapping asynchronously (likely APP_INITIALIZER) but did not provide a launchView or LoadingModule.');
+          console.warn('App is bootstrapping asynchronously (likely APP_INITIALIZER) but did not provide a launchView or LoadingModule.');
         }
       }
     });