Fix selection not inverting terminal background
Fix selection not inverting terminal background

Fixes a regression introduced in
9a0555bbba30c264f617ec9260ca00e0eab70870 where the terminal background
would not get inverted when selected.
alacritty/alacritty,jwilm/alacritty,alacritty/alacritty,jwilm/alacritty,jwilm/alacritty,jwilm/alacritty