Fix extraValue of DUMMY_NO_LANGUAGE_SUBTYPE

This is a follow up of I9cf3d94825.

Change-Id: I2646a045d21f2a7a3bb89c76d431be844e739af3

java/src/com/android/inputmethod/latin/SubtypeSwitcher.java

@@ -64,7 +64,7 @@ public final class SubtypeSwitcher {
                     + SubtypeLocaleUtils.QWERTY
                     + "," + Constants.Subtype.ExtraValue.ASCII_CAPABLE
                     + "," + Constants.Subtype.ExtraValue.ENABLED_WHEN_DEFAULT_IS_NOT_ASCII_CAPABLE
-                    + Constants.Subtype.ExtraValue.EMOJI_CAPABLE,
+                    + "," + Constants.Subtype.ExtraValue.EMOJI_CAPABLE,
             false /* isAuxiliary */, false /* overridesImplicitlyEnabledSubtype */);
     // Caveat: We probably should remove this when we add an Emoji subtype in {@link R.xml.method}.
     // Dummy Emoji subtype. See {@link R.xml.method}.