[ODE] Disabling doesn't work when bodies contact

[michael kapelko]

I understood what I was doing wrong. I have func which checks for 
disabling, i.e., it checks linear velocit, angular velocity and 
disable_steps. When velocities are below certain thresholds I increase 
disable_steps. When disable_steps are enough, I disable body. BUT! This 
disabling happens only once, right when disable_steps are enough for the 
first time. So now I'm doing disablig every update if disable_steps are 
enough, and all bodies now are disabled correctly!