Revert "Support two pane design in the Settings app."

This reverts commit a12a0d1eb2.

Reason for revert:  See a build error in git_sc-v2-dev-plus-aosp/aosp_crosshatch-userdebug

Bug: 198722766
Change-Id: Ibf812bf92595f57409e3c6d9cda6a1dfa4a8c72c

src/com/android/settings/SettingsApplication.java

@@ -1,34 +0,0 @@
-/*
- * 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.
- */
-
-package com.android.settings;
-
-import android.app.Application;
-
-import com.android.settings.activityembedding.ActivityEmbeddingRulesController;
-
-/** Settings application which sets up activity embedding rules for the large screen device. */
-public class SettingsApplication extends Application {
-
-    @Override
-    public void onCreate() {
-        super.onCreate();
-
-        final ActivityEmbeddingRulesController controller =
-                new ActivityEmbeddingRulesController(this);
-        controller.initRules();
-    }
-}