Fix the ObstacleCheck time step (Fixes #3211)

apps/openmw/mwmechanics/obstacle.cpp

@@ -120,14 +120,10 @@ namespace MWMechanics
         const MWWorld::Class& cls = actor.getClass();
         ESM::Position pos = actor.getRefData().getPosition();
 
-        // actors can move at most 60 fps (the physics framerate).
-        // the max() can be removed if we implement physics interpolation.
-        float movementDuration = std::max(1/60.f, duration);
-
         if(mDistSameSpot == -1)
             mDistSameSpot = DIST_SAME_SPOT * cls.getSpeed(actor);
 
-        float distSameSpot = mDistSameSpot * movementDuration;
+        float distSameSpot = mDistSameSpot * duration;
 
         bool samePosition =  (osg::Vec2f(pos.pos[0], pos.pos[1]) - osg::Vec2f(mPrevX, mPrevY)).length2() <  distSameSpot * distSameSpot;