Brought back TAB to switch team/all chat when nothing has been typed yet

The new ALT hotkey from https://github.com/OpenRA/OpenRA/pull/6281 is driving me nuts. When you have not typed anything and therefore nothing can be auto-completed, this will allow you to still use it to switch team and public chat.
Won't TAB do the same if Windows does not prioritize system hotkeys? After all it is ALT + TAB.