It's okay, I fixed it, I had to go to the Menu Editor on Xubuntu & remove it from there. But thanks anyway. .I'm not familiar with Discord but any software I've needed to remove was accomplish through the terminal.
sudo apt remove discord
sudo apt purge discord
sudo apt autoremove
Copy and paste each of these one at a time and then do a restart and you should be good to go.
You may have to reinstall Discord after doing this.
Hope this helps.