Update CA certificate warning to material next spec

* Fix colour extraction
* Update landscape mode
* Update logo

Screenshots:
* https://screenshot.googleplex.com/5mwbKLJeFVecrpi
* https://screenshot.googleplex.com/9z62Sw26NX5Zfwu

Bug: 191845997
Test: Manual testing with Settings
Change-Id: Id9988dbce9eabc2b69dba4bd20ca7a6729601147

res/drawable/ic_alert_red.xml

@@ -0,0 +1,31 @@
+<!--
+  ~ Copyright (C) 2021 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.
+  -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:tint="?android:attr/colorError"
+    android:viewportHeight="24.0"
+    android:viewportWidth="24.0">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M21.26,18L13.73,4.99c-0.77,-1.33 -2.69,-1.33 -3.46,0L2.74,18c-0.77,1.33 0.19,3 1.73,3h15.06C21.07,21 22.03,19.33 21.26,18zM4.47,19L12,5.99L19.53,19H4.47z" />
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M11,11v2c0,0.55 0.45,1 1,1c0.55,0 1,-0.45 1,-1v-2c0,-0.55 -0.45,-1 -1,-1C11.45,10 11,10.45 11,11z" />
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M12,17m-1,0a1,1 0,1 1,2 0a1,1 0,1 1,-2 0" />
+</vector>