[Kiosk] Whitelist ChromeVox settings page

Previously, we disabled ChromeVox settings page because its settings
persisted. Now, it is not a case.

Bug: 1049566
Change-Id: I3c719a294d1ef22b02b0835b05d45eed1f0fa50a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2364613
Commit-Queue: Anatoliy Potapchuk <apotapchuk@chromium.org>
Auto-Submit: Anatoliy Potapchuk <apotapchuk@chromium.org>
Reviewed-by: Anqing Zhao <anqing@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799993}

chrome/browser/chromeos/app_mode/kiosk_settings_navigation_throttle.cc

@@ -17,7 +17,7 @@ namespace {
 // kiosk mode.
 KioskSettingsNavigationThrottle::SettingsPage kSettingsPages[] = {
     {"chrome://os-settings/manageAccessibility", true},
-    {"chrome-extension://mndnfokpggljbaajbnioimlmbfngpief/chromevox/background/"
+    {"chrome-extension://mndnfokpggljbaajbnioimlmbfngpief/chromevox/options/"
      "options.html",
      false},
     {"chrome-extension://klbcgckkldhdhonijdbnhhaiedfkllef/", true},