[#1177] cli: Fix resource name parsing

* If `root` name is given explicitly, then it should be translated to
  `//` but not `/root/`.

Signed-off-by: Airat Arifullin <a.arifullin@yadro.com>

cmd/frostfs-cli/modules/util/ape.go

@@ -279,7 +279,7 @@ func parseResource(lexeme string, isObj bool) (string, error) {
 		if isObj {
 			if lexeme == "*" {
 				return nativeschema.ResourceFormatAllObjects, nil
-			} else if lexeme == "/*" {
+			} else if lexeme == "/*" || lexeme == "root/*" {
 				return nativeschema.ResourceFormatRootObjects, nil
 			} else if strings.HasPrefix(lexeme, "/") {
 				lexeme = lexeme[1:]