Expand BT screen.

Bug: 27106877
Change-Id: I31100598f27d45b6a50351f14bd0d20cc6e27d9d
diff --git a/res/layout/bluetooth_device_picker.xml b/res/layout/bluetooth_device_picker.xml
index 16e421f..818ebac 100755
--- a/res/layout/bluetooth_device_picker.xml
+++ b/res/layout/bluetooth_device_picker.xml
@@ -16,7 +16,7 @@
 
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
         android:gravity="center"
-        android:layout_width="wrap_content"
+        android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:orientation="vertical">