Cannot sell GL whilst above the certificate limit

[ollybh]

A player is above cert limit and must sell down. He owns the Lux, but that is not shown as being available until AFTER he has sold down to limit

https://gist.github.com/ollybh/ce7b73011dd12c8817a57bcf787ff2e3#file-hs_padpfcvi_1716881083-json