Fix #16348486 [RTL] Checkboxes are improperly aligned

- use "end" instead of "right" for gravity

Change-Id: I2f8840094b7ac6daeff55bcb457b6c3fa9dc2001

core/res/res/layout/preference_material.xml

@@ -71,7 +71,7 @@
         android:layout_width="wrap_content"
         android:layout_height="match_parent"
         android:minWidth="58dip"
-        android:gravity="right|center_vertical"
+        android:gravity="end|center_vertical"
         android:orientation="vertical" />
 
 </LinearLayout>