Not necessarily.A good shot of contact cleaner would likely be good
insurance, but if it was clean rain water the contacts will LIKELY be
OK after they are dried out.

However, if the lights (or who knows what else that also got wet)
start acting up next year remember to tell the technician looking for
the goblins that this happened. VERY slim chance of problems, but
where would you stop replacing if you were just trying to pevent a
future problem now? No-one even knows for sure what all got wet, and
how wet, and what parts are possibly going to fail because of being
wet.
Say your prayers tonight and remember to roll the windows up in the
future.