Fix the bottom row of tablet keyboard layout

This CL eliminates "_" and "/" keys from the bottom row of tablet
keyboard.  This CL also reorganizes the bottom row of tablet Dvorak
keyboard.

Bug: 16603887
Change-Id: Ic1570836dea1a475bed5d43aeb6a351507bf5428
diff --git a/java/res/xml-sw600dp/row_pcqwerty5.xml b/java/res/xml-sw600dp/row_pcqwerty5.xml
index ac07f11..4dcae14 100644
--- a/java/res/xml-sw600dp/row_pcqwerty5.xml
+++ b/java/res/xml-sw600dp/row_pcqwerty5.xml
@@ -50,6 +50,6 @@
             latin:keyXPos="-9.0%p"
             latin:keyWidth="9.0%p"
             latin:backgroundType="functional"
-            latin:keyboardLayout="@xml/key_f2" />
+            latin:keyboardLayout="@xml/key_emoji" />
     </Row>
 </merge>