raco pkg show: mention auto-installed when no non-auto are installed

In the case that packages are only auto-installed in a particular
scope, `raco pkg show` should just say "[none]", instead of adding the
note about auto-installed packages that are not being shown.

racket/collects/pkg/private/show.rkt

@@ -65,7 +65,6 @@
            empty))))
     (if (null? to-show)
         (printf " [none]\n")
-        (begin
         (table-display
          long?
          (list* 'right 'right 'middle
@@ -77,7 +76,7 @@
                  "Checksum"
                  "Source"
                  (if dir? '("Directory") '()))
-            to-show))
+          to-show)))
     (unless (or only-pkgs show-auto?)
       (define n (for/sum ([pkg (in-list pkgs)] 
                           #:when (pkg-info-auto? (hash-ref db pkg)))
@@ -86,7 +85,7 @@
         (printf "~a[~a auto-installed package~a not shown]\n"
                 indent
                 n
-                      (if (= n 1) "" "s")))))))
+                (if (= n 1) "" "s")))))
 
 (define (table-display long? dots-poses l)
   (define how-many-cols (length (first l)))