Small tweaks to contacts layout.

Remove extra 16dp padding from portrait updates list
Fix the weird padding at the top when moving between updates/ details
in portrait
Vertically center all content in updates

Fixes bug:5226206 some tweaks to Contacts details
Change-Id: I4f92c963b15f4db57ecceee7846f9c957d36279b
diff --git a/res/layout/stream_item_container.xml b/res/layout/stream_item_container.xml
index 6a65357..308c5f5 100644
--- a/res/layout/stream_item_container.xml
+++ b/res/layout/stream_item_container.xml
@@ -25,17 +25,19 @@
         android:id="@+id/stream_item_content"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:paddingTop="@dimen/detail_update_section_item_vertical_padding"
-        android:paddingBottom="@dimen/detail_update_section_item_vertical_padding"
         android:paddingLeft="@dimen/detail_update_section_item_horizontal_padding"
         android:paddingRight="@dimen/detail_update_section_item_horizontal_padding"
+        android:paddingTop="@dimen/detail_update_section_item_vertical_padding"
+        android:paddingBottom="@dimen/detail_update_section_item_vertical_padding"
         android:background="?android:attr/selectableItemBackground"
+        android:layout_gravity="center_vertical"
         />
 
     <View
         android:id="@+id/horizontal_divider"
         android:layout_width="match_parent"
         android:layout_height="1px"
-        android:background="?android:attr/dividerHorizontal" />
+        android:background="?android:attr/dividerHorizontal"
+        android:layout_gravity="bottom" />
 
 </LinearLayout>