rosenthal: Set foot TERMINFO in skeletons and fix ckbcomp path in set-keymap script.

Change to set-keymap script is a follow-up to commit
2468773dd2.

* modules/rosenthal/examples/foot/foot.ini: New file.
* modules/rosenthal/services/desktop.scm (%rosenthal-skeletons): Use it.
(%rosenthal-set-keymap-script): Fix ckbcomp path.

modules/rosenthal/examples/foot/foot.ini

@@ -0,0 +1,4 @@
+font=monospace:size=12
+
+[environment]
+TERM=xterm-256color

modules/rosenthal/services/desktop.scm

@@ -540,7 +540,7 @@ gtk-key-theme-name = ~a~%"
           (define* (build-keyboard-layout file layout #:optional variant #:key model options)
             (define pipe
               (apply open-pipe* OPEN_READ
-                     #$(file-append console-setup)
+                     #$(file-append console-setup "/bin/ckbcomp")
                      (string-append "-I" #$xkeyboard-config "/share/X11/xkb")
                      "-rules" "base"
                      `(,@(if model
@@ -649,7 +649,7 @@ set-keymap us dvorak -o ctrl:nocaps\n")
      ,(local-file "../examples/emacs/init-miscellaneous.el"))
 
     (".config/foot/foot.ini"
-     ,(plain-file "foot.ini" "font=monospace:size=12\n"))
+     ,(local-file "../examples/foot/foot.ini"))
     (".config/mako/config"
      ,(local-file "../examples/mako.conf"))
     (".config/niri/config.kdl"
@@ -681,7 +681,7 @@ configuration {
                                  (%current-system))))
 
   (define %display-manager-service-type
-    (if (string-prefix? "x86_64" system)
+    (if (target-64bit? system)
         gdm-service-type
         sddm-service-type))