samples: sensors: lsm6dso: Fix regex filter following unit fix

https://github.com/zephyrproject-rtos/zephyr/pull/49068

 fixed units
displayed by  the sample from dps to rad/s but did not update the
sample twister regex filter.
Fix the filter as well to allow testing in CI.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>