fix: remove #pragma once in .cpp file

src/core/hle/service/nvflinger/graphic_buffer_producer.cpp

@@ -4,8 +4,6 @@
 // Parts of this implementation were base on:
 // https://cs.android.com/android/platform/superproject/+/android-5.1.1_r38:frameworks/native/libs/gui/IGraphicBufferProducer.cpp
 
-#pragma once
-
 #include "core/hle/service/nvflinger/graphic_buffer_producer.h"
 #include "core/hle/service/nvflinger/parcel.h"