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_greek.xml b/java/res/xml-sw768dp/rows_greek.xml
index cf2fa40..aebe129 100644
--- a/java/res/xml-sw768dp/rows_greek.xml
+++ b/java/res/xml-sw768dp/rows_greek.xml
@@ -37,7 +37,7 @@
             latin:keyLabelFlags="disableAdditionalMoreKeys|disableKeyHintLabel" />
         <Key
             latin:keyStyle="deleteKeyStyle"
-            latin:keyWidth="fillBoth"/>
+            latin:keyWidth="fillRight"/>
     </Row>
     <Row
         latin:keyWidth="8.125%p"
@@ -50,7 +50,7 @@
             latin:keyboardLayout="@xml/rowkeys_greek2" />
         <Key
             latin:keyStyle="enterKeyStyle"
-            latin:keyWidth="fillBoth" />
+            latin:keyWidth="fillRight" />
     </Row>
     <Row
         latin:keyWidth="8.047%p"
@@ -64,7 +64,7 @@
             latin:keyboardLayout="@xml/keys_comma_period" />
         <Key
             latin:keyStyle="shiftKeyStyle"
-            latin:keyWidth="fillBoth" />
+            latin:keyWidth="fillRight" />
     </Row>
    <include
         latin:keyboardLayout="@xml/row_qwerty4" />