[MacPorts] #59959: postfix: use startupitem.pidfile

[MacPorts]

#59959: postfix: use startupitem.pidfile
------------------------+----------------------
 Reporter:  ryandesign  |      Owner:  jmroot
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.6.2
 Keywords:              |       Port:  postfix
------------------------+----------------------
 postfix uses `startupitem.start` and `startupitem.stop`. Therefore, it
 should also use `startupitem.pidfile`.

 See https://guide.macports.org/#reference.startupitems.script \\
 See https://lists.macports.org/pipermail/macports-
 users/2020-January/047882.html

 Alternately, if possible, it should use `startupitem.executable`.

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Ticket URL: <https://trac.macports.org/ticket/59959>
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