add conditional postfix plugin to the plugin list test.

Vladimir Petkorequested to merge
vpa1977/munin:autopkgtest-fix into debian

This MR fixes 1064944.

Changes: - d/t/munin-node/02.plugins.t: add conditional postfix plugin to the plugin list test.

Testing:

  • autopkgtests pass in Ubuntu[1]

[1] https://autopkgtest.ubuntu.com/results/autopkgtest-noble/noble/amd64/m/munin/20240227_081139_efb4a@/log.gz

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