Iota.display() is called on both client and server, so client configs can't consistently affect it

`Iota.display()` can be called server-side by mishaps and Reveal, and on Fabric the server does not have a client config. This means that any client config settings that would affect how iotas are displayed have to be ignored on server-side `display()` calls to avoid a NullPointerException, which leads to inconsistency in how things are displayed.