Don't use textAlignment; use gravity center

Bug: 17180817
Change-Id: I37fcb128c8a5762ca87c9ec12cce0c47c4575e16
diff --git a/res/layout/conversation_list_empty_view.xml b/res/layout/conversation_list_empty_view.xml
index 7c18fdf..cdb85b3 100644
--- a/res/layout/conversation_list_empty_view.xml
+++ b/res/layout/conversation_list_empty_view.xml
@@ -35,7 +35,7 @@
             android:layout_height="wrap_content"
             android:layout_marginTop="@dimen/empty_view_space"
             android:fontFamily="sans-serif-light"
-            android:textAlignment="center"
+            android:gravity="center"
             android:textColor="#80000000"
             android:textSize="@dimen/empty_view_text_size" />