src: remove unused using in node_trace_writer.h

There is an unnecessary using TracingController in node_trace_writer.h
and this commit removes it.

PR-URL: https://github.com/nodejs/node/pull/15646


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>