bug#68415: User's shepherd services defined in guix home config can not start after guix pull.

[Feng Shu]

After I guix pull, services defined in guix home config can no start:

-------------------------
服务 root 已启动。
WARNING: Use of `load' in declarative module (#{ g117}#).  Add #:declarative? 
#f to your define-module invocation.
unbound-variable(#f "Unbound variable: ~S" (service) #f)

Some deprecated features have been used.  Set the environment
variable GUILE_WARN_DEPRECATED to "detailed" and rerun the
program to get more information.  Set it to "no" to suppress
this message.
Creating XDG user directories... done
Comparing /gnu/store/bfkgfz1sm9q75jyn56pav2kmwl48i7w8-home/profile/share/fonts 
and
          
/gnu/store/bfkgfz1sm9q75jyn56pav2kmwl48i7w8-home/profile/share/fonts... done 
(same)
Evaluating on-change gexps.

-----------

When I run command: herd status, show error:

feng@Guix ~$ herd status
error: connect: /run/user/1000/shepherd/socket: No such file or directory




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