Fix UI corruption in landscape mode

Add window background to PeopleActivity

Bug 8796000

Change-Id: I3c6e1cb4b411ec720ab60d33e6d1c2238ba5bf90
diff --git a/res/layout/people_activity.xml b/res/layout/people_activity.xml
index 8ad36ba..589e4a9 100644
--- a/res/layout/people_activity.xml
+++ b/res/layout/people_activity.xml
@@ -17,8 +17,7 @@
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/list_container"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:background="@color/background_primary">
+    android:layout_height="match_parent">
 
     <!--
         ViewPager for swiping between tabs.  We put StrequentContactListFragment,