WebClient/HTTP API: ensure to check home dir, when needed, in multi-node setups

Behind a load balancer with no sticky sessions enabled is not enough to check
the home dir only when the client logs in

Signed-off-by: Nicola Murino <nicola.murino@gmail.com>

internal/httpd/webclient.go

@@ -954,6 +954,7 @@ func (s *httpdServer) handleClientEditFile(w http.ResponseWriter, r *http.Reques
 		return
 	}
 
+	connection.User.CheckFsRoot(connection.ID) //nolint:errcheck
 	reader, err := connection.getFileReader(name, 0, r.Method)
 	if err != nil {
 		s.renderClientMessagePage(w, r, fmt.Sprintf("Unable to get a reader for the file %#v", name), "",