Escape ${PLASMA_SESSION_FILE}

...because this is a shell script created by a pile of echo
commands. I mean, obviously. Duh. Nothing hard to understand here!

Signed-off-by: Adam Williamson <awilliam@redhat.com>

fedora-live-kde-base.ks

@@ -32,12 +32,12 @@ fi
 # set up autologin for user liveuser
 if [ -f /etc/sddm.conf ]; then
 sed -i 's/^#User=.*/User=liveuser/' /etc/sddm.conf
-sed -i "s/^#Session=.*/Session=${PLASMA_SESSION_FILE}/" /etc/sddm.conf
+sed -i "s/^#Session=.*/Session=\${PLASMA_SESSION_FILE}/" /etc/sddm.conf
 else
 cat > /etc/sddm.conf << SDDM_EOF
 [Autologin]
 User=liveuser
-Session=${PLASMA_SESSION_FILE}
+Session=\${PLASMA_SESSION_FILE}
 SDDM_EOF
 fi