dbus: Fix swapped arguments for PhoshIdleDBus

Guido Güntherrequested to merge
guidog/phosh:dbus-targets into main

Otherwise targets depending only on the headers can get it wrong.

This should fix the build failure in https://gitlab.gnome.org/World/Phosh/phosh/-/jobs/5808582

Fixes: 6376839d ("build: Separate dbus headers and sources") Signed-off-by: Guido Günther agx@sigxcpu.org

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