Fix prefs.xml

This is a follow up of Id170dbfe2d.

Change-Id: I52e4f44b7d135f51551b912c44e1dd354c16d125
diff --git a/java/res/xml/prefs.xml b/java/res/xml/prefs.xml
index 5294432..2a726c4 100644
--- a/java/res/xml/prefs.xml
+++ b/java/res/xml/prefs.xml
@@ -161,7 +161,7 @@
                 android:persistent="true"
                 android:defaultValue="true" />
             <PreferenceScreen
-                android:fragment="com.android.inputmethod.latin.AdditionalSubtypeSettings"
+                android:fragment="com.android.inputmethod.latin.settings.AdditionalSubtypeSettings"
                 android:key="custom_input_styles"
                 android:title="@string/custom_input_styles_title" />
             <ListPreference