Remove unused file WidgetsListSearchHeaderHolder

WidgetsListSearchHeaderHolder was the only file that remained after all the redundant widget search header logic got removed. It is dead code now so this CL deletes it.

Bug: 268646258
Test: Verified on device
Change-Id: I670364bd7c2d5ce46d2c8837ef483e5ac2315547
diff --git a/src/com/android/launcher3/widget/picker/WidgetsListSearchHeaderHolder.java b/src/com/android/launcher3/widget/picker/WidgetsListSearchHeaderHolder.java
deleted file mode 100644
index 9562af3..0000000
--- a/src/com/android/launcher3/widget/picker/WidgetsListSearchHeaderHolder.java
+++ /dev/null
@@ -1,32 +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.launcher3.widget.picker;
-
-import androidx.recyclerview.widget.RecyclerView.ViewHolder;
-
-/**
- * A {@link ViewHolder} for {@link WidgetsListHeader} of an app, which renders the app icon, the app
- * name, label and a button for showing / hiding widgets.
- */
-public final class WidgetsListSearchHeaderHolder extends ViewHolder {
-    final WidgetsListHeader mWidgetsListHeader;
-
-    public WidgetsListSearchHeaderHolder(WidgetsListHeader view) {
-        super(view);
-
-        mWidgetsListHeader = view;
-    }
-}