Re-enable ChromeVoxOptionsPageTest.NumberReadingStyleSelect

Mostly speculative; run locally release/debug with 20 parallel processes e.g.
testing/xvfb.py out/d/browser_tests --gtest_filter=ChromeVoxOptionsPageTest.NumberReadingStyleSelect
!! & !! & !! ...

TBR=dtseng@chromium.org

Fixed: 1052175
Change-Id: If574b244b07fd67ab3303974f554193dfd64659a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2209999Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770750}

chrome/browser/resources/chromeos/accessibility/chromevox/options/options_test.js

@@ -51,7 +51,7 @@ ChromeVoxOptionsTest = class extends ChromeVoxNextE2ETest {
   }
 };
 
-TEST_F('ChromeVoxOptionsTest', 'DISABLED_NumberReadingStyleSelect', function() {
+TEST_F('ChromeVoxOptionsTest', 'NumberReadingStyleSelect', function() {
   this.runOnOptionsPage((mockFeedback, evt) => {
     const numberStyleSelect = evt.target.find({
       role: chrome.automation.RoleType.POP_UP_BUTTON,