<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/fragment_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".activity.BaseSingleFragmentActivity" />

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/fragment_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="?attr/window_background_color"
    tools:context=".activity.BaseSingleFragmentActivity" />

Fix appearance of Settings activity in dark mode.
Fix appearance of Settings activity in dark mode.

It had a white background, which made the white text invisible.

Change-Id: Icaaa688105d8451f8a4a760a85483721ea9466ea
