Remove extra padding from the top of the labels list.

Wasn't needed and prevented an extra item from being shown
on smaller screen devices.
Fixes b/5521012 Fix padding in the folders list

Change-Id: Ifc940d44b9a8a0a0f0f9d04fc1958f4810adcdbe

res/layout/mailbox_list_fragment.xml

@@ -19,7 +19,6 @@
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:paddingTop="16dip"
     >
     <include layout="@android:layout/list_content" />
 </FrameLayout>