Jim,
You say you just "topped off" the reservoir after bleeding.
If so, did you notice it and remove this mixture from the reservoir before applying the brakes? If this is the case, I'd say that the thinner didn't get to the seals in the M/C or calipers and you'll be ok.
If the thinner did go thru the system, I'd flush them thoroughly and test the seals by holding the brakes on hard for several minutes. If the pedal does not go down and you don't see any seepage at the calipers or M/C, I'd guess it will probably be ok.
I'd still be cautious of it the first few drives and double-check for leaks afterward. Maybe even flush it again after 300-400 miles.
Good luck,
