[SCSS] Adding missing variable for border-bottom in src/themes/default/css/layout/_border.scss
[SCSS] Adding missing variable for border-bottom in src/themes/default/css/layout/_border.scss

pkarw/vue-storefront,pkarw/vue-storefront,DivanteLtd/vue-storefront,DivanteLtd/vue-storefront,DivanteLtd/vue-storefront,pkarw/vue-storefront,DivanteLtd/vue-storefront,pkarw/vue-storefront