[th/restart-nm-reset] service: don't use reset=False for nmci.nmutil.restart_NM_service()

It doesn't seem to make sense. When NM-ci restarts the daemon, it doesn't want that systemd fails and says we restarted too fast. We always want to reset the fail counter.

Otherwise, if you run a test with "Restart NM" in a loop, and the test is fast, it starts failing after a few iterations.