fix(gentoo): fix tab color completion (#9810)
fix(gentoo): fix tab color completion (#9810)

This commit fixes an issue in the gentoo theme introduced in 3bb5e977.
Due to incorrect line width calculations, colors are incorrectly applied
when using tab.

Fixes #9778

Signed-off-by: Thomas De Backer <854f1018428eabf7634aca645125bd02cd1d7bdd@debacker.me>
tekniklr/oh-my-zsh,tekniklr/oh-my-zsh