iio-sensor-proxy: delays shutdown on systemd installs
### Describe your issue #### What's the expected behaviour? quick shutdown with systemd #### What's the current behaviour? Sometimes it takes a long time to shutdown. The screen is already black and it seems like it has shutdown, but then takes another minute or so. I didn't investigate which service it is, but according to multiple reports in #3754, this is caused by the iio-sensor-proxy service. #### How to reproduce your issue? ### What device are you using? e.g. oneplus-enchilada ### On what postmarketOS version did you encounter the issue? * [x] edge (`master` branch) * [x] `v25.06` * [ ] `v24.12` * [x] I confirm that the issue still is present after running `sudo apk upgrade -a` ### On what environment did you encounter the issue? #### Environments Should affect all. ### Which init system are you using? * [ ] OpenRC * [x] systemd ### How did you get postmarketOS image? * [ ] from https://images.postmarketos.org * [ ] I built it using pmbootstrap * [ ] It was preinstalled on my device ### What's the build date of the image? (in yyyy-mm-dd format) ### Additional information
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