pkg: fix regression on output of pkg list (bug #45873) * scripts/pkg/pkg.m: cset 7fa1970a655d reduced the checks to nargout to is there nargout or not. However, the subfunction installed_packages() returns alternative things based on its own nargout (it probably should not since that makes for a messy code). Fix, pkg to call the subfunction correctly based on its nargout too (but still, use "nargout > 1" instead of "nargout == 2". * scripts/pkg/private/installed_packages.m: do not check for exact number of nargout and reduce number of function return points.

--- a/scripts/pkg/pkg.m
+++ b/scripts/pkg/pkg.m
@@ -368,7 +368,9 @@
           list_forge_packages ();
         endif
       else
-        if (nargout)
+        if (nargout == 1)
+          local_packages = installed_packages (local_list, global_list, files);
+        elseif (nargout > 1)
           [local_packages, global_packages] = installed_packages (local_list,
                                                                   global_list,
                                                                   files);