image/tree: Only show untagged images when --all flag is used

In non-expanded view, untagged images should only be displayed when the
--all flag is explicitly provided by the user.

Previously, untagged images were accidentally always shown in the
non-expanded view regardless of the --all flag setting.

Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>

cli/command/image/tree.go

@@ -111,7 +111,7 @@ func runTree(ctx context.Context, dockerCLI command.Cli, opts treeOptions) (int,
 			continue
 		}
 
-		if len(sortedTags) == 0 {
+		if opts.all && len(sortedTags) == 0 {
 			view.images = append(view.images, topImage{
 				Details:  topDetails,
 				Children: children,