Slightly wider space key for 10-inch tablet layouts

This change also removes the usage of "fillBoth" keyWidth from 10-inch
tablet layouts.

Change-Id: Ie6844fc096712daa24e09b3d67dde48d1c03eb46
diff --git a/java/res/xml-sw768dp/rows_arabic.xml b/java/res/xml-sw768dp/rows_arabic.xml
index eaa64e5..8b05d93 100644
--- a/java/res/xml-sw768dp/rows_arabic.xml
+++ b/java/res/xml-sw768dp/rows_arabic.xml
@@ -34,10 +34,10 @@
             latin:keyboardLayout="@xml/rowkeys_arabic1" />
         <Key
             latin:keyStyle="deleteKeyStyle"
-            latin:keyWidth="fillBoth" />
+            latin:keyWidth="fillRight" />
     </Row>
     <Row
-        latin:keyWidth="7.375%p"
+        latin:keyWidth="7.227%p"
     >
         <Key
             latin:keyStyle="toSymbolKeyStyle"
@@ -47,10 +47,10 @@
             latin:keyboardLayout="@xml/rowkeys_arabic2" />
         <Key
             latin:keyStyle="enterKeyStyle"
-            latin:keyWidth="fillBoth" />
+            latin:keyWidth="fillRight" />
     </Row>
     <Row
-        latin:keyWidth="7.375%p"
+        latin:keyWidth="7.227%p"
     >
         <include
             latin:keyboardLayout="@xml/rowkeys_arabic3"