Fix dropdown text is not clear in dark mode

- Move spinner color into SettingsTheme.
- Set spinnerItemStyle & spinnerDropDownItemStyle

Fixes: 222126610
Test: manual
Change-Id: I90da89d30826939a232f7dd17c4fec882b054915
diff --git a/packages/SettingsLib/SettingsSpinner/Android.bp b/packages/SettingsLib/SettingsSpinner/Android.bp
index c5b2fe6..d3cc4d1 100644
--- a/packages/SettingsLib/SettingsSpinner/Android.bp
+++ b/packages/SettingsLib/SettingsSpinner/Android.bp
@@ -15,6 +15,7 @@
 
     static_libs: [
         "androidx.preference_preference",
+        "SettingsLibSettingsTheme",
     ],
 
     sdk_version: "system_current",
diff --git a/packages/SettingsLib/SettingsSpinner/res/values-v31/colors.xml b/packages/SettingsLib/SettingsSpinner/res/values-v31/colors.xml
deleted file mode 100644
index 8fda876..0000000
--- a/packages/SettingsLib/SettingsSpinner/res/values-v31/colors.xml
+++ /dev/null
@@ -1,20 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2022 The Android Open Source Project
-
-     Licensed under the Apache License, Version 2.0 (the "License");
-     you may not use this file except in compliance with the License.
-     You may obtain a copy of the License at
-
-          http://www.apache.org/licenses/LICENSE-2.0
-
-     Unless required by applicable law or agreed to in writing, software
-     distributed under the License is distributed on an "AS IS" BASIS,
-     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-     See the License for the specific language governing permissions and
-     limitations under the License.
--->
-
-<resources>
-    <color name="settingslib_spinner_title_color">@android:color/system_neutral1_900</color>
-    <color name="settingslib_spinner_dropdown_color">@android:color/system_neutral2_700</color>
-</resources>