minArea property in tracking settings not exposed or saved in meta data yaml

[NeuroThom]

The computer vision centroid tracking pipeline includes thresholding of the top camera image, and a findContours operation. The thresholdValue is stored in the metadata.yml, but minArea, a property of the findContours node does not. I suspect this has never changed in value, but can have large impacts on the centroid if altered and has been useful to alter for improving tracking in specific experiments.