drive: fix creating a directory inside a shortcut

See: https://forum.rclone.org/t/cant-create-new-directory-on-google-drive-remote/17208

backend/drive/drive.go

@@ -1411,6 +1411,7 @@ func (f *Fs) CreateDir(ctx context.Context, pathID, leaf string) (newID string,
 	leaf = f.opt.Enc.FromStandardName(leaf)
 	// fmt.Println("Making", path)
 	// Define the metadata for the directory we are going to create.
+	pathID = actualID(pathID)
 	createInfo := &drive.File{
 		Name:        leaf,
 		Description: leaf,