[MacPorts] #60553: github portgroup livecheck values interfere with one another when github.setup is called twice

[MacPorts]

#60553: github portgroup livecheck values interfere with one another when
github.setup is called twice
-------------------------+------------------------
  Reporter:  ryandesign  |      Owner:  ryandesign
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.2
Resolution:              |   Keywords:
      Port:  github      |
-------------------------+------------------------

Comment (by iEFdev):

 Replying to [ticket:60553 ryandesign]:
 > Hopefully the fix is as simple as making all of the livecheck variables
 defaults rather than overwrites.

 Just tried this… And it works by just making both `livecheck.url` use
 default. Added another missing default to `livecheck.regex`, to make it
 consistant - and made a PR: https://github.com/macports/macports-
 ports/pull/7294

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Ticket URL: <https://trac.macports.org/ticket/60553#comment:3>
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