Colors intefere with vim-airline under monokai

[KireinaHoro]

Without tmux, my vim session looks like the following:

which is well readable and comfortable.

When inside tmux with maglev, the vim session looks like this:

You can see that the texts in the vim statusline are barely readable.

Maybe we can adjust the colors a little? Or restrict the color themes to the tmux statuslines only?

[caiogondim]

PRs are welcome.
I dont have the time to fix issues on this project.