This is not done for gdm-service-type, so do not do it here either, for
consistency. Perhaps that change had been motivated by the fact that using
ratpoison without a default terminal makes for a poor user experience (one
cannot even view the help screen without a terminal); this was fixed with the
preceding commit.
* gnu/services/xorg.scm (slim-service-type)
[profile-service-type]: Remove extension.