playbook: Fix missing permission for slapuser
In the Wendelin learning track this permission is granted to the user via "chgrp SLAPUSER /dev/i2c-3". Because we don't know the particular slapuser we have to add the permission to all users of the slapsoft group. Because /sys/bus/i2c/devices/i2c-3 is a virtual directory and we want to make sure that even after rebooting or unplugging / replugging of the sensor the permission is still granted udev rules have been added.
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