Please Verify BSE1N Spectra are being calculated correctly

Created by: ghost

Looks like all values are being multiplied by 2/3 for spectrum, where seems like only y values should be scaled:

https://github.com/usgs/earthquake-design-ws/blob/2a7df9317c8cd57da813c53cbe054eaad3852c7c/src/lib/asce41_13-factory.js#L135