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/rows_symbols.xml b/java/res/xml-sw600dp/rows_symbols.xml
index a915c33..05e7c68 100644
--- a/java/res/xml-sw600dp/rows_symbols.xml
+++ b/java/res/xml-sw600dp/rows_symbols.xml
@@ -70,6 +70,6 @@
         <include
             latin:keyboardLayout="@xml/row_symbols4" />
         <include
-            latin:keyboardLayout="@xml/key_f2" />
+            latin:keyboardLayout="@xml/key_emoji" />
     </Row>
 </merge>