Changed camera model to pinhole (no lens distortion) for non-wide cameras

[CenekAlbl]

Should be more stable for small number of calibration images.

[saching13]

if reprojection_error_threshold is high too high then doesn't it affect the users who try to use it with pnp ?

[CenekAlbl]

I needed to set higher reprojection error treshold to accomodate for lower number of camera parameters. Not sure about the value honestly - these numbers worked for the 3 cameras I had factory images for, but might still introduce failed calibrations on others. I think we should either validate with more cameras or incease it even further. What do you mean exactly by affect pnp?