fix refresh ProgressBar halo

Turns out 'wrap_content' means little/nothing to ProgressBar: it ends up
sized as 48dp per the minHeight/maxHeight in the framework styles. This
causes the drawable to draw to a 48dp height, so funny artifacts aren't
surprising.

Force a fixed height for the refresh progress bar based on the custom
asset height.

Bug: 9101567
Change-Id: Id7949895bc757b3522d059e4fba4c1713c2a1da8
diff --git a/res/layout/conversation_list_progress.xml b/res/layout/conversation_list_progress.xml
index 4a44c05..3259b98 100644
--- a/res/layout/conversation_list_progress.xml
+++ b/res/layout/conversation_list_progress.xml
@@ -31,7 +31,7 @@
     <ProgressBar
         android:id="@+id/progress"
         android:layout_width="match_parent"
-        android:layout_height="wrap_content"
+        android:layout_height="5dp"
         android:layout_gravity="top"
         android:visibility="gone"
         android:indeterminateDrawable="@drawable/progress_indeterminate_horizontal_holo"