fix: Fixed displaying black foreground color after `linebreak` module broke it

[frol]

$ ./target/release/powerline-rs --shell bare --modules 'ps,ssh,time,cwd,perms,git,gitstage,root,virtualenv' --cwd-max-dir-size 40 --time_format '%H:%M' 0

Before:

After:

Just for reference, the bug was introduced in #15.

cc @lazamar