Overlay property instead of style

Overlaying the whole style with sw720dp will override dark theme styles.
Let's instead define the attribute that needs to be different and put it
in a config xml.

Test: set smallest width to 720, flip to dark theme
Fixes: 180003967
Change-Id: I423f3401b612e7e87a63f3f14f972b9d863d8a17
diff --git a/res/values-sw720dp/styles.xml b/res/values-sw720dp/styles.xml
index f322e9f..c1e6eca 100644
--- a/res/values-sw720dp/styles.xml
+++ b/res/values-sw720dp/styles.xml
@@ -18,16 +18,6 @@
 -->
 
 <resources>
-
-    <style name="BaseLauncherTheme" parent="@android:style/Theme.DeviceDefault.Light.NoActionBar">
-        <item name="android:windowBackground">@android:color/transparent</item>
-        <item name="android:colorBackgroundCacheHint">@null</item>
-        <item name="android:windowShowWallpaper">true</item>
-        <item name="android:windowNoTitle">true</item>
-        <item name="android:windowActionModeOverlay">true</item>
-        <item name="android:colorEdgeEffect">?android:attr/textColorSecondary</item>
-    </style>
-
     <!-- Workspace -->
     <style name="DropTargetButton" parent="DropTargetButtonBase">
         <item name="android:paddingLeft">60dp</item>
@@ -36,5 +26,4 @@
         <item name="android:shadowDy">0.0</item>
         <item name="android:shadowRadius">2.0</item>
     </style>
-
 </resources>
\ No newline at end of file