Fix Key to use a disabled icon when the key is disabled

Bug: 6114350
Change-Id: I419bc1736c27046dfea254ac510f5da478b6412c
diff --git a/java/src/com/android/inputmethod/keyboard/Key.java b/java/src/com/android/inputmethod/keyboard/Key.java
index b8d04e0..79c7ce0 100644
--- a/java/src/com/android/inputmethod/keyboard/Key.java
+++ b/java/src/com/android/inputmethod/keyboard/Key.java
@@ -558,11 +558,8 @@
     }
 
     public Drawable getIcon(KeyboardIconsSet iconSet) {
-        return iconSet.getIconDrawable(mIconId);
-    }
-
-    public Drawable getDisabledIcon(KeyboardIconsSet iconSet) {
-        return iconSet.getIconDrawable(mDisabledIconId);
+        final int iconId = mEnabled ? mIconId : mDisabledIconId;
+        return iconSet.getIconDrawable(iconId);
     }
 
     public Drawable getPreviewIcon(KeyboardIconsSet iconSet) {