[MacPorts] #63649: mtpaint: update to 3.50

[MacPorts]

#63649: mtpaint: update to 3.50
----------------------+----------------------
  Reporter:  mascguy  |      Owner:  mascguy
      Type:  update   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.7.1
Resolution:           |   Keywords:
      Port:  mtpaint  |
----------------------+----------------------
Changes (by mascguy):

 * status:  new => assigned
 * owner:  (none) => mascguy


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Ticket URL: <https://trac.macports.org/ticket/63649#comment:2>
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