tests: event: new test case
tests: event: new test case

Verify that the active-low flag is respected when reading line values
from lines configured for events.

Signed-off-by: Bartosz Golaszewski <108de5fbc428215dc26df4468b48691526611148@gmail.com>

brgl/libgpiod,brgl/libgpiod,brgl/libgpiod,brgl/libgpiod