vk: make upscaler dynamic

The config option was marked as dynamic, but was never actually changed ingame

rpcs3/Emu/RSX/VK/VKGSRender.h

@@ -384,6 +384,7 @@ class VKGSRender : public GSRender, public ::rsx::reports::ZCULL_control
 
 	std::unique_ptr<vk::text_writer> m_text_writer;
 	std::unique_ptr<vk::upscaler> m_upscaler;
+	bool m_use_fsr_upscaling{false};
 
 	std::unique_ptr<vk::buffer> m_cond_render_buffer;
 	u64 m_cond_render_sync_tag = 0;

rpcs3/Emu/RSX/VK/VKPresent.cpp

@@ -595,9 +595,13 @@ void VKGSRender::flip(const rsx::display_flip_info_t& info)
 		target_layout = VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL;
 	}
 
-	if (!m_upscaler)
+	const bool use_fsr_upscaling = g_cfg.video.vk.fsr_upscaling.get();
+
+	if (!m_upscaler || m_use_fsr_upscaling != use_fsr_upscaling)
 	{
-		if (g_cfg.video.vk.fsr_upscaling)
+		m_use_fsr_upscaling = use_fsr_upscaling;
+
+		if (m_use_fsr_upscaling)
 		{
 			m_upscaler = std::make_unique<vk::fsr_upscale_pass>();
 		}
@@ -616,7 +620,7 @@ void VKGSRender::flip(const rsx::display_flip_info_t& info)
 			if (image_to_flip) calibration_src.push_back(image_to_flip);
 			if (image_to_flip2) calibration_src.push_back(image_to_flip2);
 
-			if (g_cfg.video.vk.fsr_upscaling && !avconfig._3d) // 3D will be implemented later
+			if (m_use_fsr_upscaling && !avconfig._3d) // 3D will be implemented later
 			{
 				// Run upscaling pass before the rest of the output effects pipeline
 				// This can be done with all upscalers but we already get bilinear upscaling for free if we just out the filters directly