Revert "lib: optimize writable stream buffer clearing"

This reverts commit 8a2fec1.

PR-URL: #59743
Reviewed-By: Mattias Buelens <mattias@buelens.com>
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Ethan Arrowood <ethan@arrowood.dev>

Author: ri7116

lib/internal/streams/writable.js

@@ -784,7 +784,7 @@ function clearBuffer(stream, state) {
     if (i === buffered.length) {
       resetBuffer(state);
     } else if (i > 256) {
-      state[kBufferedValue] = ArrayPrototypeSlice(buffered, i);
+      buffered.splice(0, i);
       state.bufferedIndex = 0;
     } else {
       state.bufferedIndex = i;