use correct license headers

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

src/main/res/layout/activity_list_item_header_shimmer.xml

@@ -11,11 +11,11 @@
 
   This program 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
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
   GNU AFFERO GENERAL PUBLIC LICENSE for more details.
 
   You should have received a copy of the GNU Affero General Public
-  License along with this program.  If not, see <http://www.gnu.org/licenses/>.
+  License along with this program. If not, see <http://www.gnu.org/licenses/>.
 -->
 <com.elyeproj.loaderviewlibrary.LoaderTextView xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/shimmer_header"

src/main/res/layout/activity_list_item_shimmer.xml

@@ -1,4 +1,5 @@
-<?xml version="1.0" encoding="utf-8"?><!--
+<?xml version="1.0" encoding="utf-8"?>
+<!--
   Nextcloud Android client application
 
   Copyright (C) 2020 Andy Scherzinger

src/main/res/layout/contactlist_list_item_shimmer.xml

@@ -1,4 +1,5 @@
-<?xml version="1.0" encoding="utf-8"?><!--
+<?xml version="1.0" encoding="utf-8"?>
+<!--
   Nextcloud Android client application
 
   Copyright (C) 2020 Andy Scherzinger

src/main/res/layout/synced_folders_list_item_shimmer.xml

@@ -1,4 +1,5 @@
-<?xml version="1.0" encoding="utf-8"?><!--
+<?xml version="1.0" encoding="utf-8"?>
+<!--
   Nextcloud Android client application
 
   Copyright (C) 2020 Andy Scherzinger

src/main/res/layout/trashbin_item_shimmer.xml

@@ -1,23 +1,23 @@
-<?xml version="1.0" encoding="UTF-8"?><!--
-  ownCloud Android client application
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Nextcloud Android client application
 
-  Copyright (C) 2012  Bartek Przybylski
-  Copyright (C) 2015 ownCloud Inc.
+  Copyright (C) 2020 Andy Scherzinger
 
-  This program is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License version 2,
-  as published by the Free Software Foundation.
+  This program is free software; you can redistribute it and/or
+  modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
+  License as published by the Free Software Foundation; either
+  version 3 of the License, or any later version.
 
   This program 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.
+  GNU AFFERO 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/>.
- -->
+  You should have received a copy of the GNU Affero General Public
+  License along with this program. If not, see <http://www.gnu.org/licenses/>.
+-->
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:id="@+id/ListItemLayout"
     android:layout_width="match_parent"