(#22414) Renamed for consistency `$nav-disabled-link-color`, `$nav-ta…

Created by: pat270

…bs-active-link-color, $nav-tabs-active-link-bg, $nav-tabs-active-link-border-color, $nav-pills-active-link-color, $nav-pills-active-link-bgto$nav-link-disabled-color, $nav-tabs-link-active-color, $nav-tabs-link-active-bg, $nav-tabs-link-active-border-color, $nav-pills-link-active-color, $nav-pills-link-active-bg`, respectively

https://github.com/twbs/bootstrap/issues/22414