Move Settings preferenceCategory style into SettingsTheme

Bug: 176407895
Test: manual
Change-Id: I98245dfdf27a3848c24e81f4d5d8f5f19e1e817c
diff --git a/res/values/styles_preference.xml b/res/values/styles_preference.xml
index b88a9fb..6453458 100644
--- a/res/values/styles_preference.xml
+++ b/res/values/styles_preference.xml
@@ -25,16 +25,9 @@
         <item name="slicePreferenceStyle">@style/SlicePreference</item>
         <item name="seekBarPreferenceStyle">@style/SettingsSeekBarPreference</item>
         <item name="twoStateButtonPreferenceStyle">@style/TwoStateButtonPreference</item>
-        <item name="preferenceCategoryTitleTextAppearance">@style/TextAppearance.CategoryTitle
-        </item>
-        <item name="preferenceCategoryStyle">@style/SettingsCategoryPreference</item>
-        <!-- For preference category color -->
-        <item name="preferenceCategoryTitleTextColor">?android:attr/textColorSecondary</item>
         <item name="preferenceFragmentCompatStyle">@style/SettingsPreferenceFragmentStyle</item>
     </style>
 
-    <style name="SettingsCategoryPreference" parent="Preference.Category.Material" />
-
     <style name="PreferenceTheme.SetupWizard">
         <item name="preferenceFragmentCompatStyle">@style/SetupWizardPreferenceFragmentStyle</item>
         <item name="preferenceStyle">@style/Preference.Material</item>