If "Terminal", being the actual interactive shell that replaces "Web Shell", does everything "Command Shell" does and more, I would see no reason to include "Command Shell".
Whatever you decide, you might want to specify that "Terminal" is replacing "Web Shell as the interactive shell in the Change Log.
Web shell (shellinabox):
Completely removed in v18.0 (Webmin now has a proper interactive shell).
Terminal
If "Terminal", being the actual interactive shell that replaces "Web Shell", does everything "Command Shell" does and more, I would see no reason to include "Command Shell".
Whatever you decide, you might want to specify that "Terminal" is replacing "Web Shell as the interactive shell in the Change Log.