Update Arabic font for SystemUI

- bug #5987379 Need an Arabic font with metrics "compatible" with Roboto
- use the Alt version with GSUB optimizations

Change-Id: I4d8c62cab37a7b010abab602c39899084d347fdc
diff --git a/data/fonts/fallback_fonts.xml b/data/fonts/fallback_fonts.xml
index a4b5212..69d223e 100644
--- a/data/fonts/fallback_fonts.xml
+++ b/data/fonts/fallback_fonts.xml
@@ -34,7 +34,7 @@
 <familyset>
     <family>
         <fileset>
-            <file>DroidNaskh-Regular-Shift.ttf</file>
+            <file>DroidNaskh-Regular-SystemUI.ttf</file>
         </fileset>
     </family>
     <family>