uvdata_to_telescope_config doesn't pass baseline subsets

[jpober]

If you load a UVData object, run select on it to eliminate some baselines, and then create a yaml file, all the baselines still get simulated. One solution would be for this method check the baseline_array and then pass the list of actually existent baselines to the select keyword in the yaml file. There may be other things that don't get passed to the yaml file too (frequencies seems to work, at least).