The dircolors command from coreutils knows the st terminal,
but not the stterm terminal.
In coreutils-8.25/src/dircolors.hin:37 we have:
but no stterm. I would suggest not changing the terminal name,
thus dropping these two patches:
I can't guess why it has been renamed in the first place, but
if the reason doesn't apply anymore I think it would be a good
idea not to rename it at all and provide a bin/stterm -> bin/st
symlink for compatibility.