lib: remove obsolete deletion of bufferBinding.zeroFill

PR-URL: nodejs#47881
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Minwoo Jung <nodecorelab@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Khaidi Chu <i@2333.moe>

lib/internal/bootstrap/node.js

@@ -390,7 +390,6 @@ function setupBuffer() {
   // Only after this point can C++ use Buffer::New()
   bufferBinding.setBufferPrototype(Buffer.prototype);
   delete bufferBinding.setBufferPrototype;
-  delete bufferBinding.zeroFill;
 
   // Create global.Buffer as getters so that we have a
   // deprecation path for these in ES Modules.