report: remove `internalBinding('config').hasReport`

The `setup()` method is only called when the `--experimental-report`
option is set. `getOptionValue()` returns `undefined` when
the flag is not defined, so the extra check inside of `setup()` is
redundant.

PR-URL: https://github.com/nodejs/node/pull/25610


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>