Field name consistency related to VDF parameters in link.csv

[asu-trans-ai-lab]

The link file's fields should be consistent with the sample data sets in the latest DTALite data set. For example, we do not have different time periods, so we should not have the number "1" in the field name.

https://github.com/jdlph/Path4GMNS/blob/dev/data/Chicago_Sketch/link.csv

https://github.com/asu-trans-ai-lab/DTALite/blob/main/data/02_Sioux_Falls/minimum_input/link.csv