[MacPorts] #35969: py-goocanvas: adding license and correcting indentation in Portfile

[MacPorts]

#35969: py-goocanvas: adding license and correcting indentation in Portfile
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 Reporter:  alexander.afanasyev@…         |       Owner:  macports-tickets@…                   
     Type:  defect                        |      Status:  new                                  
 Priority:  Normal                        |   Milestone:                                       
Component:  ports                         |     Version:  2.1.2                                
 Keywords:                                |        Port:  py-goocanvas                         
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 The attached Portfile fixes indentation in Portfile and adds license
 GPL-2+

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Ticket URL: <https://trac.macports.org/ticket/35969>
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