services: xorg: Remove unused #:guile parameter.

* gnu/services/xorg.scm (xorg-wrapper): Remove #:guile, which was unused.
(xorg-start-command): Likewise.
(xinitrc): Likewise.

doc/guix.texi

@@ -13352,7 +13352,7 @@ type @code{<sddm-configuration>}.
 @end example
 @end deffn
-@deffn {Scheme Procedure} xorg-start-command [#:guile] @
+@deffn {Scheme Procedure} xorg-start-command @
   [#:modules %default-xorg-modules] @
   [#:fonts %default-xorg-fonts] @
   [#:configuration-file (xorg-configuration-file @dots{})] @

gnu/services/xorg.scm

@@ -261,7 +261,6 @@ (define files
                        #t))))
 
 (define* (xorg-wrapper #:key
-                       (guile (canonical-package guile-2.0))
                        (modules %default-xorg-modules)
                        (configuration-file (xorg-configuration-file
                                             #:modules modules))
@@ -287,7 +286,6 @@ (define exp
   (program-file "X-wrapper" exp))
 
 (define* (xorg-start-command #:key
-                             (guile (canonical-package guile-2.0))
                              (modules %default-xorg-modules)
                              (fonts %default-xorg-fonts)
                              (configuration-file
@@ -300,8 +298,7 @@ (define* (xorg-start-command #:key
 @code{xorg-wrapper} for more details on the arguments.  The result should be
 used in place of @code{startx}."
   (define X
-    (xorg-wrapper #:guile guile
-                  #:configuration-file configuration-file
+    (xorg-wrapper #:configuration-file configuration-file
                   #:modules modules
                   #:xorg-server xorg-server))
   (define exp
@@ -312,9 +309,7 @@ (define exp
 
   (program-file "startx" exp))
 
-(define* (xinitrc #:key
-                  (guile (canonical-package guile-2.0))
-                  fallback-session)
+(define* (xinitrc #:key fallback-session)
   "Return a system-wide xinitrc script that starts the specified X session,
 which should be passed to this script as the first argument.  If not, the
 @var{fallback-session} will be used or, if @var{fallback-session} is false, a