emscripten: update test

Signed-off-by: Rui Chen <rui@chenrui.dev>

Author: chenrui333

Formula/e/emscripten.rb

@@ -219,8 +219,6 @@ def caveats
     # Avoid errors on Linux when other formulae like `sdl12-compat` are installed
     ENV.delete "CPATH"
 
-    ENV["NODE_OPTIONS"] = "--no-experimental-fetch"
-
     (testpath/"test.c").write <<~C
       #include <stdio.h>
       int main()