Fix secondary thick text color for dark theme.

The secondary thick text color for dark theme points to the wrong
color definition.

Change-Id: I6256b1e9a965656a26f415abfa197f4e654d86db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2622755Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Tomasz Wiszkowski <ender@google.com>
Cr-Commit-Position: refs/heads/master@{#842311}

ui/android/java/res/values-v17/styles.xml

@@ -235,7 +235,7 @@
         <item name="android:textColor">@color/default_text_color_light_list</item>
     </style>
     <style name="TextAppearance.TextMediumThick.Secondary.Light" tools:ignore="UnusedResources">
-        <item name="android:textColor">@color/default_text_color_light_list</item>
+        <item name="android:textColor">@color/default_text_color_secondary_light_list</item>
     </style>
 
     <style name="TextAppearance.TextLarge.Secondary.Light" tools:ignore="UnusedResources">