Change the NTSO radio logo

[Enakai]

I don't really think this warrants a whole thread, but I'm unsure where else to put it. Anyway, could we get the NTSOs radio icon changed from "CAP" to the "H" icon? I'm seeing NTSOs constantly mistaken for being the captain due to the "CAP" icon next to their name in chat when speaking on the radio and it's leading to a lot of confused crew.

[aft2001]

Alternatively, the icon should just be "NT". It's unique to their role yet indicative of what role they are, instead of just being a generic Head

[Sov]

https://github.com/goonstation/goonstation/pull/786