Set systemctl enabled on Jellyfin service

This was not set for Fedora; I do not recall if this was just an oversight or was
explicitly removed in the past; open to feedback there.

Reported in the LUP Bug-A-Thon

fedora/jellyfin.spec

@@ -127,6 +127,9 @@ if [ $1 -gt 1 ] ; then
     if [ "${service_state}" = "active" ]; then
         systemctl start jellyfin.service
     fi
+    if [ "${service_state}" != "active" ]; then
+        systemctl enable jellyfin.service
+    fi
 fi
 %systemd_post jellyfin.service