Fix the non-working period key in the tablet layout.

One of the edge flags was wrong.
diff --git a/java/res/xml-xlarge/kbd_qwerty.xml b/java/res/xml-xlarge/kbd_qwerty.xml
index e710b34..d1dd613 100644
--- a/java/res/xml-xlarge/kbd_qwerty.xml
+++ b/java/res/xml-xlarge/kbd_qwerty.xml
@@ -186,7 +186,7 @@
             android:keyWidth="12.5%p"
             android:isModifier="true"
             android:isSticky="true"
-            android:keyEdgeFlags="left" />
+            android:keyEdgeFlags="right" />
     </Row>
     <Row
         android:rowEdgeFlags="bottom"