No, the chance of it being red is much higher. If there's one green ball in the jar, than all previous draws would've needed to avoid the green one. The chances of that happening are way less than 50%.

Initially there is an equal chance that there are 99 or 100 red balls.

But if there is a green ball, it is unlikely to be the last picked. So the fact that you saw 99 red balls makes it unlikely there is a green ball.