hle/lock: Remove #pragma once in cpp file

src/core/hle/lock.cpp

@@ -2,10 +2,8 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
-#pragma once
-
 #include <core/hle/lock.h>
 
 namespace HLE {
 std::recursive_mutex g_hle_lock;
-}
+} // namespace HLE