Wallpaper settings should be opaque.

More UX improvements to follow.

Change-Id: Ia3e2a149f9a5005297c3705af07da70229ccbd84
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 9768338..7055f9c 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -96,7 +96,7 @@
         <activity
             android:label="@string/clock_settings"
             android:name="com.android.wallpaper.polarclock.PolarClockSettings"
-            android:theme="@android:style/Theme.Light.WallpaperSettings"
+            android:theme="@android:style/Theme"
             android:exported="true">
         </activity>