Bug 1217003 - Tabs tray (List): Add drawable padding for audio indicator. r=margaret

This patch is using the same value we use in the tabs tray grid (tabs_layout_item_view.xml).

--HG--
extra : commitid : I4YLFKAccy1
extra : rebase_source : 21cee94b2ca474228437368ea9219f26670080a7

mobile/android/base/resources/layout/tabs_list_item_view.xml

@@ -47,6 +47,7 @@
                   android:gravity="center_vertical"
                   android:singleLine="false"
                   android:maxLines="4"
+                  android:drawablePadding="6dp"
                   android:duplicateParentState="true"/>
 
     </LinearLayout>