IMS-VT: set default height for preview video container

Set default height for preview video container to 70dp

Change-Id: Ic031057773b89e98a44f892fc6d4fe1df59a025b
CRs-Fixed: 2039429
diff --git a/InCallUI/res/layout/video_call_views.xml b/InCallUI/res/layout/video_call_views.xml
index 1926fcc..8292803 100644
--- a/InCallUI/res/layout/video_call_views.xml
+++ b/InCallUI/res/layout/video_call_views.xml
@@ -33,7 +33,7 @@
     <FrameLayout
         android:id="@+id/previewVideoContainer"
         android:layout_width="70dp"
-        android:layout_height="0dp"
+        android:layout_height="70dp"
         android:layout_gravity="bottom|right"
         android:layout_margin="@dimen/video_preview_margin" >