Add an icon for US keyboard subtype

- TODO: add other icons

Change-Id: Ie958b9d59bb33bd6dbfc78a403bfda022bfaf790

java/res/xml/method.xml

@@ -26,7 +26,7 @@
 <input-method xmlns:android="http://schemas.android.com/apk/res/android"
         android:settingsActivity="com.android.inputmethod.latin.LatinIMESettings"
         android:isDefault="@bool/im_is_default">
-    <subtype android:icon="@drawable/ic_subtype_keyboard"
+    <subtype android:icon="@drawable/ic_sybtype_us_keyboard"
             android:imeSubtypeLocale="cs"
             android:imeSubtypeMode="@string/subtype_mode_keyboard"
     />