Cleanup: remove contributors, license begin/end & doxy file argument

This had already been removed for all source files,
recent patches re-introduced them.

source/blender/blenkernel/intern/image_save.c

@@ -1,6 +1,4 @@
 /*
- * ***** BEGIN GPL LICENSE BLOCK *****
- *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * as published by the Free Software Foundation; either version 2
@@ -17,13 +15,9 @@
  *
  * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
  * All rights reserved.
- *
- * Contributor(s): Blender Foundation, 2019
- *
- * ***** END GPL LICENSE BLOCK *****
  */
 
-/** \file blender/blenkernel/intern/image_save.c
+/** \file
  *  \ingroup bke
  */