Achievements: Use big picture for confirm hardcore disable

src/core/fullscreen_ui.h

@@ -1,11 +1,15 @@
-// SPDX-FileCopyrightText: 2019-2022 Connor McLaughlin <stenzek@gmail.com>
+// SPDX-FileCopyrightText: 2019-2023 Connor McLaughlin <stenzek@gmail.com>
 // SPDX-License-Identifier: (GPL-3.0 OR CC-BY-NC-ND-4.0)
 
 #pragma once
+
 #include "common/progress_callback.h"
 #include "common/types.h"
+
+#include <functional>
 #include <memory>
 #include <string>
+#include <string_view>
 
 class SmallStringBase;
 
@@ -37,10 +41,6 @@ void Render();
 void InvalidateCoverCache();
 void TimeToPrintableString(SmallStringBase* str, time_t t);
 
-// Returns true if the message has been dismissed.
-bool DrawErrorWindow(const char* message);
-bool DrawConfirmWindow(const char* message, bool* result);
-
 class ProgressCallback final : public BaseProgressCallback
 {
 public: