fix(gx): dispatch SDL window events in SceneClear()

src/gx/glsdl/CGxDeviceGLSDL.cpp

@@ -1268,6 +1268,8 @@ void CGxDeviceGLSDL::SceneClear(uint32_t mask, CImVector color) {
 }
 
 void CGxDeviceGLSDL::ScenePresent() {
+    this->m_GLSDLWindow.DispatchEvents();
+
     if (this->m_context) {
         // TODO