fix default test runtime

Author: s1gr1d

dev-packages/e2e-tests/test-applications/hono-4/tests/constants.ts

@@ -1,5 +1,5 @@
 export type Runtime = 'cloudflare' | 'node' | 'bun';
 
-export const RUNTIME = (process.env.RUNTIME || 'node') as Runtime;
+export const RUNTIME = (process.env.RUNTIME || 'cloudflare') as Runtime;
 
 export const APP_NAME = 'hono-4';