[MacPorts] #55457: QGIS, qgis3: fix license

[MacPorts]

#55457: QGIS, qgis3: fix license
------------------------+-------------------------
 Reporter:  ryandesign  |      Owner:  Veence
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  QGIS, qgis3
------------------------+-------------------------
 The source code files in the QGIS and qgis3 ports say:

 {{{
 /***************************************************************************
  *
 *
  *   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 of the License, or
 *
  *   (at your option) any later version.
 *
  *
 *
 ***************************************************************************/
 }}}

 So please change the license line of both ports to read:

 {{{
 license GPL-2+
 }}}

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Ticket URL: <https://trac.macports.org/ticket/55457>
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