Use status-fg

[vdbe]

Is there an existing issue outlining your improvement?

• I have searched the existing issues and my improvement has not been raised yet.

What would you like to see added and/or changed?

We currently set status-bg and use the [bg=default] but do not set status-fg which results in using [fg=$thm_fg].

when using [fg=default] users would be able to change the default it's however not perfect since the fg color is often something other then $thm_fg.