Qt: Fix low-resolution icon

Source/Core/DolphinQt2/QtUtils/WinIconHelper.h

@@ -0,0 +1,16 @@
+// Copyright 2018 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#ifdef _WIN32
+
+#include <QIcon>
+
+namespace WinIconHelper
+{
+QIcon GetNativeIcon();
+};
+
+#endif