tls: fix throughput issues after incorrect merge

1e066e4a was done incorrectly and has overwritten an important change
in: c17449df. Using bigger output buffer increases performance in 3-4
times.

PR-URL: https://github.com/nodejs/node/pull/2381
Fix: https://github.com/joyent/node/issues/25803
Reviewed-By: Trevor Norris <trev.norris@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>

src/tls_wrap.h

@@ -53,7 +53,7 @@ class TLSWrap : public crypto::SSLWrap<TLSWrap>,
   size_t self_size() const override { return sizeof(*this); }
 
  protected:
-  static const int kClearOutChunkSize = 1024;
+  static const int kClearOutChunkSize = 16384;
 
   // Maximum number of bytes for hello parser
   static const int kMaxHelloLength = 16384;