fmt: Make sure write_fmt's implementation can use write_char
fmt: Make sure write_fmt's implementation can use write_char

It looks like the Adapter inside write_fmt was never updated to forward
the write_char method.

graydon/rust,GBGamer/rust,graydon/rust,aidancully/rust,GBGamer/rust,graydon/rust,aidancully/rust,aidancully/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,graydon/rust,GBGamer/rust,graydon/rust,graydon/rust,GBGamer/rust,GBGamer/rust,aidancully/rust