Remove unused and unnecessary drawables

Change-Id: I7db0ee5e2aa06bba9b9f340aa6f71412c5a22c9a

java/res/drawable-land/btn_keyboard_key.xml

-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2008 The Android Open Source Project
-
-     Licensed under the Apache License, Version 2.0 (the "License");
-     you may not use this file except in compliance with the License.
-     You may obtain a copy of the License at
-
-          http://www.apache.org/licenses/LICENSE-2.0
-
-     Unless required by applicable law or agreed to in writing, software
-     distributed under the License is distributed on an "AS IS" BASIS,
-     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-     See the License for the specific language governing permissions and
-     limitations under the License.
--->
-
-<selector xmlns:android="http://schemas.android.com/apk/res/android">
-
-    <!-- Toggle keys. Use checkable/checked state. -->
-    
-    <item android:state_checkable="true" android:state_checked="true" 
-          android:state_pressed="true"
-          android:drawable="@drawable/btn_keyboard_key_pressed_on" />
-    <item android:state_checkable="true" android:state_pressed="true"
-          android:drawable="@drawable/btn_keyboard_key_pressed_off" />
-    <item android:state_checkable="true" android:state_checked="true"
-          android:drawable="@drawable/btn_keyboard_key_normal_on" />
-    <item android:state_checkable="true"
-          android:drawable="@drawable/btn_keyboard_key_normal_off" />
-
-    <!-- Normal keys -->
-
-    <item android:state_pressed="true"
-          android:drawable="@drawable/btn_keyboard_key_pressed" />
-    <item
-          android:drawable="@drawable/btn_keyboard_key_normal" />
-          
-</selector>