button on WTFcsv to select one column as X axis

On this (not very important test CSV) the first column is for the x-axis:

https://databasic.io/en/wtfcsv/results/59e4f42b7088b45635d044df

...and this may come up from time to time. Perhaps one additional view of the data could be generated if someone clicks `Use this as X-axis` on one of the column-based graphs.

Thanks, ❤️  this site!