services: tor: Make sure /var/lib is world-readable.

* gnu/services/networking.scm (tor-hidden-service-activation): Add
'chmod' call for /var/lib.

gnu/services/networking.scm

@@ -467,6 +467,9 @@ (define (initialize service)
       (chown "/var/lib/tor" (passwd:uid %user) (passwd:gid %user))
       (chmod "/var/lib/tor" #o700)
 
+      ;; Make sure /var/lib is accessible to the 'tor' user.
+      (chmod "/var/lib" #o755)
+
       (for-each initialize
                 '#$(map hidden-service-name
                         (tor-configuration-hidden-services config)))))