LineageParts: update preference category title text color

 * Update preference category title text color from colorAccent to textColorSecondary to match AOSP titles

Change-Id: I8747dc98077d5247b54d7f90e267448cbedc45ab
Signed-off-by: Timi <timi.rautamaki@gmail.com>
diff --git a/res/values/styles.xml b/res/values/styles.xml
index c9c5cdb..f2bd2e4 100644
--- a/res/values/styles.xml
+++ b/res/values/styles.xml
@@ -64,6 +64,7 @@
     <style name="PreferenceTheme" parent="@style/PreferenceThemeOverlay.SettingsBase">
         <item name="preferenceCategoryTitleTextAppearance">@style/TextAppearance.CategoryTitle
         </item>
+        <item name="preferenceCategoryTitleTextColor">?android:attr/textColorSecondary</item>
     </style>
 
     <style name="PreferenceHeaderPanelSinglePane">