Recently initial-session-user and initial-session-command has been
added, but they accept only strings, not gexps.
* gnu/services/base.scm (make-greetd-terminal-configuration-file):
Ungexp initial-session-user and initial-session-command.
Change-Id: I2b247464528b6147eab8acea08c6942ac7bfd0ab
Signed-off-by: Ludovic Courtès <ludo@gnu.org>