Move fractionalSecondsDigits between second and timeZoneName
Change order of reading options.
To sync with the July 20 PR change in
https://github.com/tc39/ecma402/commit/ba085a91117d4da403b8ece9cb59589091806e59
Latest ECMA402 PR https://github.com/tc39/ecma402/pull/347

Bug: v8:10836
Change-Id: Ia414e0c7cc18502ccabaf02abd19861410b87cae
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2378460Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69591}