New versions of Iosevka seem to not be callable simply through 'Iosevka'
as before but require the full 'Iosevka Nerd Font' terminus for my case
of having the archlinux nerdfont package for the font installed.
This commit fixes wrong fonts in wayland and the wezterm terminal as
well as a longer running issue in mpv so they all correctly display
Iosevka.
