shared_translation: Fix pragma once

src/yuzu/configuration/shared_translation.h

@@ -1,6 +1,8 @@
 // SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
+#pragma once
+
 #include <map>
 #include <memory>
 #include <string>