removed header from redistributed code

demos/eigenmvn.h

-// WOLF - Copyright (C) 2020,2021,2022,2023,2024,2025
-// Institut de Robòtica i Informàtica Industrial, CSIC-UPC.
-// Authors: Joan Solà Ortega (jsola@iri.upc.edu) and
-// Joan Vallvé Navarro (jvallve@iri.upc.edu)
-// All rights reserved.
-//
-// This file is part of WOLF: http://www.iri.upc.edu/wolf
-// WOLF is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
-// NOT WOLF CODE
+// This is not part of WOLF
+
 /**
  * Multivariate Normal distribution sampling using C++11 and Eigen matrices.
  *