[MacPorts] #71173: rawtherapee: quartz variant broken by pr: app_contents not set globally

[MacPorts]

#71173: rawtherapee: quartz variant broken by pr: app_contents not set globally
---------------------+-------------------------
 Reporter:  mascguy  |      Owner:  mascguy
     Type:  defect   |     Status:  assigned
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.10.2
 Keywords:           |       Port:  rawtherapee
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 Quartz was broken by a PR from 4/2024, due to variable `app_contents` not
 set globally.

 This is trivial to fix, and a commit will be added momentarily.

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Ticket URL: <https://trac.macports.org/ticket/71173>
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