Thunar copy operation status tray icon should not be an action icon

Just forwarding this issue here: https://github.com/PapirusDevelopmentTeam/papirus-icon-theme/issues/2490

It's not critical or anything, I guess it's just about finding the time for designing the icons. I've seen other icons in the panel/ icon theme folder (not part of the freedesktop spec I think) for the copy operation where they have icons for a paused status, error and symbolic progress bar animation, just to give some ideas.