Revert "refactor(node/buffer): update cloudflare hybrid exports (#321)"

[vicb]

The tests are actually failing

workerd/server/server.c++:3851: debug: [ TEST ] tests:buffer_implements
[server] unenv/runtime/node/buffer from /tests
workerd/io/worker.c++:2065: info: uncaught exception; source = Uncaught (in promise); stack = TypeError: Failed to execute 'isAscii' on 'BufferUtil': parameter 1 is not of type 'ArrayBuffer or ArrayBufferView'.
    at Module.isAscii (node-internal:internal_buffer:1763:23)
    at Object.test (tests:39:22)
workerd/util/symbolizer.c++:158: warning: llvm-symbolizer was not found. To symbolize stack traces, install it in your $PATH or set $LLVM_SYMBOLIZER to the location of the binary. When running tests under bazel, use `--test_env=LLVM_SYMBOLIZER=<path>`.
workerd/io/io-context.c++:352: info: uncaught exception; exception = workerd/jsg/_virtual_includes/jsg/workerd/jsg/value.h:1372: failed: jsg.TypeError: Failed to execute 'isAscii' on 'BufferUtil': parameter 1 is not of type 'ArrayBuffer or ArrayBufferView'.
workerd/server/server.c++:3859: debug: [ FAIL ] tests:buffer_implements

The CI also needs to be fixed to reflect that

/cc @anonrig

[anonrig]

I opened a PR to fix the test: #325

[anonrig]

It seems we have a bug on the runtime. Ref: cloudflare/workerd#2907

We can land this and once that fix is released, I can open a new pull-request.

[vicb]

unneeded after #325