contact: improve default contact picture

Change-Id: I02aaa6715995e2344a9227c2e3c3f70b74f5101f
diff --git a/ring-android/app/src/main/res/layout/frag_navigation.xml b/ring-android/app/src/main/res/layout/frag_navigation.xml
index 1515674..61968b6 100644
--- a/ring-android/app/src/main/res/layout/frag_navigation.xml
+++ b/ring-android/app/src/main/res/layout/frag_navigation.xml
@@ -31,7 +31,7 @@
                     android:layout_height="80dp"
                     android:layout_alignParentTop="true"
                     android:layout_centerHorizontal="true"
-                    tools:src="@drawable/ic_contact_picture" />
+                    tools:src="@drawable/ic_contact_picture_fallback" />
 
                 <View
                     android:id="@+id/anchor"