Update Assistant options for voice match verification

Copied from email thread:
EnableRequireVoiceMatchVerification option is intended to be used
independent of whether or not the user has speaker id models on-device
(i.e. Libassistant ignores that option if user has no SID model).
The downside of conditionally enabling it would be: If the speech
pipeline is already running when that option is set, the change won't
take effect until next Speech pipeline restart (b/120241931).

Bug: b/120241931
Test: Manual Test
Change-Id: I0deef204ef5c6dd9ee36acbb5074d1a2e47731c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1824676Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: Yue Li <updowndota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700389}

chromeos/services/assistant/assistant_manager_service_impl.cc

@@ -1199,9 +1199,7 @@ void AssistantManagerServiceImpl::UpdateInternalOptions(
         assistant_client::InternalOptions::UserCredentialMode::SIGNED_OUT);
   }
 
-  if (assistant_settings_manager_->speaker_id_enrollment_done()) {
-    internal_options->EnableRequireVoiceMatchVerification();
-  }
+  internal_options->EnableRequireVoiceMatchVerification();
 
   assistant_manager_internal->SetOptions(*internal_options, [](bool success) {
     DVLOG(2) << "set options: " << success;