style: remove unecessary module imports from system declaration

buer.scm

@@ -1,9 +1,7 @@
 #|Modules|#
 (use-modules
  #|GNU  |# (gnu)
-           (gnu services)
- #|Guix |# (guix gexp)
- #|Misc |# (ice-9 match)
+ #|Guix |# (guix)
  #|Radix|# (radix artwork)
            (radix packages linux)
            (radix packages text-editors)
@@ -14,9 +12,6 @@
            ((radix files doas)     #:prefix file:doas-)
            ((radix files thinkfan) #:prefix file:thinkfan-))
 
-(use-system-modules
- #|N|# nss)
-
 (use-service-modules
  #|A|# admin avahi
  #|D|# desktop