Updates for pix4d.config

[StarGeek]

The link to the specs in the pix4d.config file no longer works. The correct link has dropped the text after the number
https://support.pix4d.com/hc/en-us/articles/360016450032

Additionally, the spec says that a few of the tags are rational, but in the config file they are set to real. I think this covers the changes needed

Code Select Expand

GPSXYAccuracy
GPSZAccuracy
GyroRate
IMUPitchAccu
IMUPitchAccuracy
IMURollAccuracy
IMUYawAccuracy
NominalCameraDistance