test: move __WEEX__ flag to runtime for tests

test/vitest.setup.ts

@@ -1,3 +1,5 @@
+(global as any).__WEEX__ = false
+
 import './helpers/shim-done'
 import './helpers/to-have-warned'
 import './helpers/wait-for-update'

vitest.config.ts

@@ -16,9 +16,6 @@ export default defineConfig({
       vue: resolve('src/platforms/web/entry-runtime-with-compiler')
     }
   },
-  define: {
-    __WEEX__: false
-  },
   test: {
     globals: true,
     environment: 'jsdom',