Change the size of the list so that we can actually see items.

This is temporary until the rest of the conversation view is in place.

Change-Id: I55bee386232600cec949ba2650a42236239fd3c0
diff --git a/res/layout/conversation_view.xml b/res/layout/conversation_view.xml
index 73bf7fa..a133e3f 100644
--- a/res/layout/conversation_view.xml
+++ b/res/layout/conversation_view.xml
@@ -24,7 +24,9 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:ellipsize="end"/>
+    <!-- TODO: set layout_height to wrap_content once the rest
+    of the conversation view is in place -->
     <ListView android:id="@+id/message_list"
         android:layout_width="match_parent"
-        android:layout_height="wrap_content"/>
+        android:layout_height="match_parent"/>
 </LinearLayout>
\ No newline at end of file