Patch: Call js_finalise after gui_quit()

Hello, this patch changes the shutdown order. js_finalise() must be called after gui_quit, otherwise, gui_quit() will try to free javascript context belonging to a javascript runtime which is already shutdown. (gui_quit closes / destroys all open windows, which means it also frees the js contexts at that point). Another approach would be to collect all available js context before calling JS_DestroyRuntime(). Greets, Ole