graphics: drop image heap table snapshots superseded at the same base

src/graphics/host_gpu/renderer/renderContext.cpp

@@ -148,6 +148,7 @@ void RenderContext::RunGarbageCollector() {
 		m_buffer_cache.ProcessFaultBuffer();
 	}
 	m_texture_cache.ProcessDownloadImages();
+	m_image_heap.RunGarbageCollector();
 	m_texture_cache.RunGarbageCollector();
 	m_buffer_cache.RunGarbageCollector();
 }