[MacPorts] #60924: macos-fortress: Update startupitems for MacPorts 2.6.3

[MacPorts]

#60924: macos-fortress: Update startupitems for MacPorts 2.6.3
------------------------+----------------------------
 Reporter:  ryandesign  |      Owner:  essandess
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.6.3
 Keywords:              |       Port:  macos-fortress
------------------------+----------------------------
 macos-fortress and its subports need to adjust their usage of
 `startupitems` for compatibility with MacPorts 2.6.3. For examples of what
 to do, see [https://github.com/macports/macports-ports/pull/7892/files
 this PR for adblock2privoxy] and [https://github.com/macports/macports-
 ports/pull/7893 this PR for mail-server].

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Ticket URL: <https://trac.macports.org/ticket/60924>
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