Small issue in Object Tracker

[michaelgorkow]

Hi,

I am too lazy right now for a pull request but there is a small error in the object tracker regarding the scaling factor: https://github.com/sassoftware/python-esppy/blob/master/esppy/windows/objectTracker.py

In line 230 the code is this: OutputFeature.set(self,mode,prefix,tracks,velocity_vector,newborn_tracks,scale_x,scale_x)

You're loosing the scale_y factor due to copy&paste error.

It should be: OutputFeature.set(self,mode,prefix,tracks,velocity_vector,newborn_tracks,scale_x,scale_y)

Best regards, Michael Gorkow