Use $navbar-collapse-responsive-break break point for second level dropdown big screen rules

Problem/Motivation

In themes/bs_bootstrap/sass/components/partials/_navbar-second-level-dropdown.scss we use

@include media-breakpoint-up($responsive-break)

for big screen second level dropdown navigation rules.

Instead of that we should use

@if breakpoint-max($navbar-collapse-responsive-break) != null {
  @include media-breakpoint-up($navbar-collapse-responsive-break) {

Like we are using on other places.