InputCommon/DualShockUDPClient: Add missing header guard

Prevents potential inclusion issues from occurring.

Source/Core/InputCommon/ControllerInterface/DualShockUDPClient/DualShockUDPClient.h

@@ -2,6 +2,8 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#pragma once
+
 #include "Common/Config/Config.h"
 
 namespace ciface::DualShockUDPClient

Source/Core/InputCommon/ControllerInterface/DualShockUDPClient/DualShockUDPProto.h

@@ -2,6 +2,8 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#pragma once
+
 #include <optional>
 
 #include <zlib.h>