Update ctr image pull all platforms

Allows supporting fetching of all platforms while unpacking for a subset
of platforms.

Signed-off-by: Derek McGowan <derek@mcg.dev>

cmd/ctr/commands/images/pull.go

@@ -106,20 +106,20 @@ command. As part of this process, we do the following:
 			}
 
 			var sopts []image.StoreOpt
-			if !context.Bool("all-platforms") {
 			p, err := platforms.ParseAll(context.StringSlice("platform"))
 			if err != nil {
 				return err
 			}
-				if len(p) == 0 {
-					p = append(p, platforms.DefaultSpec())
-				}
-				sopts = append(sopts, image.WithPlatforms(p...))
 
 			// Set unpack configuration
 			for _, platform := range p {
 				sopts = append(sopts, image.WithUnpack(platform, context.String("snapshotter")))
 			}
+			if !context.Bool("all-platforms") {
+				if len(p) == 0 {
+					p = append(p, platforms.DefaultSpec())
+				}
+				sopts = append(sopts, image.WithPlatforms(p...))
 			}
 			// TODO: Support unpack for all platforms..?
 			// Pass in a *?