[BUG] system tray icon not visible

[llimeht]

Description
System tray icon for projecteur not visible.

To Reproduce

• compiling the current develop branch (ddb942d)
• compiled and installed on Debian forky (current development release)
• run projecteur
• look for system try icon to be able to configure
• (can manually cause the settings to be shown using projecteur -c settings=show)

Expected behavior
System tray icon should appear allowing control/configuration.

Desktop/Linux Environment (please complete the following information):

• Linux Distribution and Version: Debian forky
• Desktop/Window Manager and Version plasma 6.7.4 . qt 6.10
• Did you built Projecteur yourself?: y
• What is the output of projecteur -f ?:

$ projecteur -f
kf.coreaddons.kaboutdata: Could not initialize the equivalent properties of Q*Application: no instance (yet) existing.
Projecteur 1.0.0-alpha.78
  - git-branch: develop
  - git-hash: ddb942d87355fd5a4f90212b22b66da61deb6d3e
  - compiler: GNU 15.3.0
  - build-type: Release
  - qt-version: (build: 6.10.2, runtime: 6.10.2)
  - device-scan: (errors: 0, devices: 1 [readable: 1, writable: 1])

• What is the output of projecteur -d ?: ...

$ projecteur -d
kf.coreaddons.kaboutdata: Could not initialize the equivalent properties of Q*Application: no instance (yet) existing.
Projecteur 1.0.0-alpha.78; device scan

 * Found one supported device. (1 readable, 1 writable)

 +++ name:     'Logitech USB Receiver'
     userName: 'Logitech Spotlight (USB)'
     vendorId:  046d
     productId: c53e
     phys:      usb-0000:02:00.0-3
     busType:   BusType::Usb
     devices:   /dev/input/event8, /dev/input/event11, /dev/input/event9, /dev/input/event10, /dev/hidraw3
     readable:  true
     writable:  true

(I have now been able to confirm this in a fresh installation of plasma with projecteur so this is not an artifact of my test setup as I had first wondered)