Clean up style for Xlib setup script

dotfiles/config/Xlib/bin/setup

@@ -1,11 +1,11 @@
 #!/bin/bash
 
-host=$(hostname -s)
+THIS_HOST=$(hostname -s)
 
-cat<<EOF > $HOME/.Xdefaults
-!! This file is generated by .config/Xlib/bin/setup
-!! from mydots.  Changes are not tracked by mydots.
-
-# include "$HOME/.config/Xlib/global.Xdefaults"
-# include "$HOME/.config/Xlib/host/${host}.Xdefaults"
-EOF
+{
+    printf '!! This file is generated by .config/Xlib/bin/setup\n'
+    printf '!! from mydots.  Changes are not tracked by mydots.\n'
+    printf '\n'
+    printf '# include "%s/.config/Xlib/global.Xdefaults"\n' "$HOME"
+    printf '# include "%s/.config/Xlib/host/%s.Xdefaults"\n' "$HOME" "$THIS_HOST"
+}> "$HOME/.Xdefaults"