Go: add API mode check in file system command (#16022)

### What problem does this PR solve?

As title.

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

internal/cli/cli_http.go

@@ -328,7 +328,7 @@ func (c *CLI) ExecuteUserCommand(cmd *Command) (ResponseIf, error) {
 	case "save_config_command":
 		return c.SaveServerConfig(cmd)
 	case "file_system_command":
-		return c.executeFilesystem(cmd)
+		return c.ExecuteFilesystemCommand(cmd)
 	default:
 		return nil, fmt.Errorf("command '%s' would be executed with API", cmd.Type)
 	}