Slightly wider keys for 7-inch tablet layouts

This change also removes the usage of "fillBoth" keyWidth from 7-inch
tablet layouts.

Bug: 6480505
Change-Id: I9ed58e0b49138fa9e1610c2b008798eedb19dd26
diff --git a/java/res/xml-sw600dp/rows_pcqwerty.xml b/java/res/xml-sw600dp/rows_pcqwerty.xml
index 0c74114..fa6080a 100644
--- a/java/res/xml-sw600dp/rows_pcqwerty.xml
+++ b/java/res/xml-sw600dp/rows_pcqwerty.xml
@@ -30,7 +30,7 @@
             latin:keyboardLayout="@xml/rowkeys_pcqwerty1" />
         <Key
             latin:keyStyle="deleteKeyStyle"
-            latin:keyWidth="fillBoth" />
+            latin:keyWidth="fillRight" />
     </Row>
     <Row
         latin:keyWidth="7.0%p"
@@ -52,7 +52,7 @@
             latin:keyboardLayout="@xml/rowkeys_pcqwerty3" />
         <Key
             latin:keyStyle="enterKeyStyle"
-            latin:keyWidth="fillBoth" />
+            latin:keyWidth="fillRight" />
     </Row>
     <Row
         latin:keyWidth="7.0%p"