hle: service: kernel_helpers: Remove unnecessary pragma once.

src/core/hle/service/kernel_helpers.cpp

@@ -2,8 +2,6 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
-#pragma once
-
 #include "core/core.h"
 #include "core/hle/kernel/k_event.h"
 #include "core/hle/kernel/k_process.h"