Set statusBarColor to secondary_device_default_settings

The SettingsDrawer has a translucent scrim on top of status bar,
which makes the color of status bar darker. By resetting the
statusBarColor we can make the real color of status bar to
"#242424" as close as possible.

Bug: 30811708
Test: Manual - Take a screenshot
Change-Id: I639ccac9d32aff9df5854c009da1fae15ba0e71f
diff --git a/res/values/themes.xml b/res/values/themes.xml
index 02bf523..3d129b3 100644
--- a/res/values/themes.xml
+++ b/res/values/themes.xml
@@ -152,6 +152,8 @@
         <item name="*android:regularColor">@color/lock_pattern_view_regular_color</item>
         <item name="*android:successColor">@color/lock_pattern_view_success_color</item>
         <item name="*android:errorColor">@color/lock_pattern_view_error_color</item>
+
+        <item name="android:statusBarColor">@*android:color/secondary_device_default_settings</item>
     </style>
 
     <style name="Theme.SubSettings" parent="Theme.Settings">