[WifiSettings] Remove unused Wi-Fi icon

wifi_signal_light was replaced by wifi_signal (which can take any
color via theme attributes). Remove the unused assets.

Change-Id: If1823f9fa74ddaeb54f4a79a5d42db3b24f723d9

res/drawable/wifi_signal_light.xml

@@ -1,22 +0,0 @@
-<?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"
-        xmlns:settings="http://schemas.android.com/apk/res/com.android.settings">
-    <item settings:state_encrypted="true" android:drawable="@drawable/wifi_signal_lock_light" />
-    <item settings:state_encrypted="false" android:drawable="@drawable/wifi_signal_open_light" />
-</selector>
-

res/drawable/wifi_signal_lock_light.xml

@@ -1,23 +0,0 @@
-<?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.
--->
-
-<level-list xmlns:android="http://schemas.android.com/apk/res/android">
-    <item android:maxLevel="0" android:drawable="@drawable/ic_wifi_lock_signal_1_light" />
-    <item android:maxLevel="1" android:drawable="@drawable/ic_wifi_lock_signal_2_light" />
-    <item android:maxLevel="2" android:drawable="@drawable/ic_wifi_lock_signal_3_light" />
-    <item android:maxLevel="3" android:drawable="@drawable/ic_wifi_lock_signal_4_light" />
-</level-list>
-

res/drawable/wifi_signal_open_light.xml

@@ -1,23 +0,0 @@
-<?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.
--->
-
-<level-list xmlns:android="http://schemas.android.com/apk/res/android">
-    <item android:maxLevel="0" android:drawable="@drawable/ic_wifi_signal_1_light" />
-    <item android:maxLevel="1" android:drawable="@drawable/ic_wifi_signal_2_light" />
-    <item android:maxLevel="2" android:drawable="@drawable/ic_wifi_signal_3_light" />
-    <item android:maxLevel="3" android:drawable="@drawable/ic_wifi_signal_4_light" />
-</level-list>
-