fix: visual selection not wisible when termguicolors disabled

[MitchiLaser]

When the termguicolor option is not set within vim then a visual selection is not visible because the selection color is the same as the background color of the line. The following picture shows how it looks:

The changes in this pull request make the selection visible again:

[janospapp]

+1

For me the behavior didn't depend on termguicolors, but my Vim had a default for ctermfg that the plugin left unchanged. After setting it to NONE my text color came back as expected.

[MitchiLaser]

I already forked the repo and fixed the problem so I can install it with the Plugin manager I use. Hoefully this repo comes to live again but as long as there is no activity I a going to use MitchiLaser/fork-nord-vim instead