Revert "DolphinQt: Minor consistency fixes for the Settings window"

This reverts commit 9d45bac175.

Source/Core/DolphinQt/Settings/BroadbandAdapterSettingsDialog.h

@@ -1,28 +0,0 @@
-// Copyright 2021 Dolphin Emulator Project
-// SPDX-License-Identifier: GPL-2.0-or-later
-
-#pragma once
-
-#include <QDialog>
-
-class QLineEdit;
-
-class BroadbandAdapterSettingsDialog final : public QDialog
-{
-  Q_OBJECT
-public:
-  enum class Type
-  {
-    Ethernet,
-    XLinkKai,
-  };
-
-  explicit BroadbandAdapterSettingsDialog(QWidget* target, Type bba_type);
-
-private:
-  QLineEdit* m_address_input;
-  Type m_bba_type;
-
-  void InitControls();
-  void SaveAddress();
-};