[Lighthouse] Use friendlyMessage for error display.
[Lighthouse] Use friendlyMessage for error display.

We started losing important information here because of Lighthouse's
i18n pipeline.

See https://github.com/GoogleChrome/lighthouse/issues/6512#issuecomment-657625216

Change-Id: I57aeeda12a7fe4b15ed6df52e4324f5d07636735
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2366297
Reviewed-by: Paul Irish <5f672bbedd2fccb2b3e838838e74ef989148de66@chromium.org>
Reviewed-by: Patrick Hulce <bd397f27e3cdacf00febe65bd487d4f902af1179@chromium.org>
Commit-Queue: Paul Irish <5f672bbedd2fccb2b3e838838e74ef989148de66@chromium.org>

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