esbuild: do not relativize node's built-in modules
esbuild: do not relativize node's built-in modules

This is followup of https://crrev.com/c/3430082.

This fixes error like
https://logs.chromium.org/logs/devtools-frontend/buildbucket/cr-buildbucket/8823327185154097217/+/u/compile__with_patch_/raw_io.output_text_failure_summary_

Bug: 1278663
Cq-Include-Trybots: luci.devtools-frontend.try:devtools_frontend_linux_blink_light_rel_fastbuild,devtools_frontend_linux_dbg_fastbuild
Change-Id: Ibdb456f32a3ffa1a24998e2ee58190cb396945cc
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3435628
Auto-Submit: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>
Reviewed-by: Tim Van der Lippe <dba8716ee7f8d16236046f74d2167cb94410f6ed@chromium.org>
Commit-Queue: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>

ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend