Similar to when we changed the color to the default mode-prompt.
I didn't notice that because my prompt uses $fish_color_error here, so
I reused the same color.
These are used in prompts only, and it feels weird not to have them.
In practice, fish_color_host_remote would not be used at all (just
because you switched from the default theme!), while fish_color_status
would fall back on a different value.
That'll be adjusted in the next commit.
