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No longer need to hide voice match settings option.
No longer need to show opt-in flow instead of voice training flow.
Update browser tests.

browser_tests

Bug: b/132107317
Test: run OSSettingsGoogleAssistantPageTest.AllJsTests in
Change-Id: I518603672ef06f7b849532adf23581abfaeb56b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2322066Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Yue Li <updowndota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792849}