Unused drawables removed.

app/src/main/res/drawable/notify_panel_notification_icon_bg_tile.xml

-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2011 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.
--->
-
-<bitmap
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    android:tileMode="repeat"
-    android:src="@drawable/notify_panel_notification_icon_bg"
-    />

app/src/main/res/drawable/shadow_repeat.xml

-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (c) 2013, Redsolution LTD. All rights reserved.
-
-     This file is part of Xabber project; you can redistribute it and/or
-     modify it under the terms of the GNU General Public License, Version 3.
-
-     Xabber is distributed in the hope that it will be useful, but
-     WITHOUT ANY WARRANTY; without even the implied warranty of
-     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-     See the GNU General Public License for more details.
-
-     You should have received a copy of the GNU General Public License,
-     along with this program. If not, see http://www.gnu.org/licenses/.
--->
-<bitmap
-	xmlns:android="http://schemas.android.com/apk/res/android"
-    android:src="@drawable/shadow" 
-    android:tileMode="repeat"
-	/>