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/row_symbols4.xml b/java/res/xml-sw768dp/row_symbols4.xml
index 167fc5e..bd85b40 100644
--- a/java/res/xml-sw768dp/row_symbols4.xml
+++ b/java/res/xml-sw768dp/row_symbols4.xml
@@ -28,11 +28,11 @@
             latin:keyboardLayout="@xml/key_settings" />
         <Key
             latin:keyLabel="/"
-            latin:keyXPos="15.157%p" />
+            latin:keyXPos="13.829%p" />
         <Key
             latin:keyLabel="\@" />
         <include
-            latin:keyXPos="31.250%p"
+            latin:keyXPos="29.923%p"
             latin:keyboardLayout="@xml/key_space" />
         <Key
             latin:keyLabel="&quot;"