Unflake ChromeVoxSettingsPagesTest.TtsRateCommand

TBR=dtseng@chromium.org

AX-Relnotes: n/a
Fixed: 1125221
Change-Id: I1516f582a0a2e65b908f47989d7fcc4ec25c9ab3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2399561Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805120}

chrome/browser/resources/chromeos/accessibility/chromevox/background/settings_test.js

@@ -58,7 +58,8 @@ TEST_F(
             realTts, AbstractTts.RATE, false);
 
         mockFeedback.call(doCmd('showTtsSettings'))
-            .expectSpeech('Text-to-Speech voice settings subpage back button')
+            .expectSpeech(
+                /(Settings)|(Text-to-Speech voice settings subpage back button)/)
 
             // ChromeVox presents a 0% to 100% scale.
             // Ensure we have the default rate.