file-systems: Move %control-groups from %base-file-systems to

%elogind-file-systems.

* gnu/system/file-systems.scm (%base-file-systems): Move %control-groups from
here, to ...
(%elogind-file-systems): ... here.

gnu/system/file-systems.scm

@@ -284,6 +284,7 @@ TARGET in the other system."
 (define %elogind-file-systems
   ;; We don't use systemd, but these file systems are needed for elogind,
   ;; which was extracted from systemd.
+  (append
    (list (file-system
            (device "none")
            (mount-point "/run/systemd")
@@ -310,15 +311,15 @@ TARGET in the other system."
            (check? #f)
            (options "none,name=elogind")
            (create-mount-point? #t)
-          (dependencies (list (car %control-groups))))))
+           (dependencies (list (car %control-groups)))))
+   %control-groups))
 
 (define %base-file-systems
   ;; List of basic file systems to be mounted.  Note that /proc and /sys are
   ;; currently mounted by the initrd.
-  (append (list %pseudo-terminal-file-system
+  (list %pseudo-terminal-file-system
         %shared-memory-file-system
-                %immutable-store)
-          %control-groups))
+        %immutable-store))
 
 ;; File systems for Linux containers differ from %base-file-systems in that
 ;; they impose additional restrictions such as no-exec or need different