samples: sensor: Fix sensor shell application build command
samples: sensor: Fix sensor shell application build command

Fixes the sensor shell sample application build command to use the
correct source directory.

Signed-off-by: Maureen Helm <87a696db5547fa477bda9f9e0f00013c839c14d3@intel.com>

zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,galak/zephyr,galak/zephyr