[MacPorts] #46979: Fix livecheck for pyxplot

[MacPorts]

#46979: Fix livecheck for pyxplot
---------------------------------+--------------------------------
 Reporter:  mschamschula@…       |      Owner:  macports-tickets@…
     Type:  defect               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.3.3
 Keywords:  haspatch maintainer  |       Port:  pyxplot
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 livecheck failed to properly parse http://pyxplot.org.uk/download.html,
 but using http://pyxplot.org.uk/src/ instead works correctly.

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Ticket URL: <https://trac.macports.org/ticket/46979>
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