gello: cleanup resources

fix npe on tablets too

Change-Id: I1ea17887672813b2de72a05f63c6c4f695605459
Signed-off-by: jrizzoli <joey@cyanogenmoditalia.it>
diff --git a/res/layout/tab_bar.xml b/res/layout/tab_bar.xml
index bbb22a5..09c9673 100644
--- a/res/layout/tab_bar.xml
+++ b/res/layout/tab_bar.xml
@@ -28,5 +28,5 @@
         style="@style/NavButton"
         android:layout_width="wrap_content"
         android:background="@drawable/add_tab_selector"
-        android:src="@drawable/ic_menu_new_window" />
+        android:src="@drawable/ic_action_add_tab" />
 </merge>