Code comment misleading: No exponential backoff on submit_measurement

[aagbsn]

backend/ooniapi/services/ooniprobe/src/ooniprobe/routers/v1/probe_services.py

Line 980 in 75664aa

# Use exponential back off with jitter between retries to avoid choking the fastpath server

I don't see how this implements exponential backoff; the comment should be removed or add exponential backoff.