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",