[aur-general] delete lejos_nxj; replaced by lejos-nxj

Hello. I am the current maintainer for both lejos_nxj and lejos-nxj. lejos_nxj had been outdated (and poorly written) for some time, and when I got ownership of it, I thought it was probably a good time to simultaneously upload an updated version, and fix the ugly underscore name scheme used by the original author of lejos_nxj. I would like very much if lejos_nxj could be deleted. Thank you.