[fixed][0.9.5] Light type 9804 doesn't flicker correctly

[SlayeR]

As the subject says.

It's meant to change to a random value between intensity 1 and 2, hold it for a bit, then change again. In GZDoom they seem to stay at intensity 1, and every now and again change to intensity 2 for a tick, then change back...

[Graf Zahl]

Fixed.

For unknown reasons I swapped the code that handles the 2 flickering light types.