samples/sensor/sensor_shell: removed deprecated set_conf_file

The samples/sensor/sensor_shell sample was introduced after deprecation
of set_conf_file and thus was not adopted to the new recommended board
conf file overlay.

This commit align this sample with the rest of Zephyr's samples.

Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>
1 file changed