Common: Make HookableEvent use non-static data.

Co-authored-by: Dentomologist <dentomologist@gmail.com>

Source/Core/VideoCommon/BPStructs.cpp

@@ -4,7 +4,6 @@
 #include "VideoCommon/BPStructs.h"
 
 #include <algorithm>
-#include <cmath>
 #include <cstring>
 #include <string>
 
@@ -341,6 +340,8 @@ static void BPWritten(PixelShaderManager& pixel_shader_manager, XFStateManager&
           false, false, yScale, s_gammaLUT[PE_copy.gamma], bpmem.triggerEFBCopy.clamp_top,
           bpmem.triggerEFBCopy.clamp_bottom, bpmem.copyfilter.GetCoefficients());
 
+      auto& system = Core::System::GetInstance();
+
       // This is as closest as we have to an "end of the frame"
       // It works 99% of the time.
       // But sometimes games want to render an XFB larger than the EFB's 640x528 pixel resolution
@@ -348,7 +349,7 @@ static void BPWritten(PixelShaderManager& pixel_shader_manager, XFStateManager&
       // render multiple sub-frames and arrange the XFB copies in next to each-other in main memory
       // so they form a single completed XFB.
       // See https://dolphin-emu.org/blog/2017/11/19/hybridxfb/ for examples and more detail.
-      AfterFrameEvent::Trigger(Core::System::GetInstance());
+      system.GetVideoEvents().after_frame_event.Trigger(system);
 
       // Note: Theoretically, in the future we could track the VI configuration and try to detect
       //       when an XFB is the last XFB copy of a frame. Not only would we get a clean "end of
@@ -356,7 +357,6 @@ static void BPWritten(PixelShaderManager& pixel_shader_manager, XFStateManager&
       //       Might also clean up some issues with games doing XFB copies they don't intend to
       //       display.
 
-      auto& system = Core::System::GetInstance();
       if (g_ActiveConfig.bImmediateXFB)
       {
         // TODO: GetTicks is not sane from the GPU thread.