Correct base16-nord color mappings

[camflint]

Corrects the base16-nord.sh script colors, so that green is green, red is red, etc. Based on a similar fix to ada-lovecraft/base16-nord-scheme.

BEFORE:

AFTER:

[j-c-m]

These files are generated by the https://github.com/chriskempson/base16-builder-php - to update the nord schema colors either:

PR against here to an updated/maintained repo: https://github.com/chriskempson/base16-schemes-source/blob/master/list.yaml#L30

PR against here to correct the original repo (although it looks fairly abandoned). https://github.com/ada-lovecraft/base16-nord-scheme

[anamyk]

can this be merged into the main branch? the fix works!