Make sure to call rcl_arguments_fini at the end of the test.
Make sure to call rcl_arguments_fini at the end of the test.

This just prevents a memory leak.

Signed-off-by: Chris Lalancette <281cd07d7578d97c83271fbbf2faddb83ab3791c@openrobotics.org>

ros2/rcl,ros2/rcl