Password grant flow doesn't log errors from Login method

[tomqwpl]

Standard flow:

	identity, ok, err := passwordConnector.Login(r.Context(), scopes, username, password)
	if err != nil {
		s.logger.Errorf("Failed to login user: %v", err)

Password flow:

identity, ok, err := passwordConnector.Login(r.Context(), parseScopes(scopes), username, password)
if err != nil {
	s.tokenErrHelper(w, errInvalidRequest, "Could not login user", http.StatusBadRequest)