ISTWCMS-7216: don't force headers in site footer to be white, because they...

ISTWCMS-7216: don't force headers in site footer to be white, because they will naturally inherit that and this is stopping colours needed when there are section backgrounds from applying

src/patterns/03-layouts/site-footer/_site-footer.scss

@@ -58,7 +58,6 @@
     h4,
     h5,
     h6{
-      color: var(--uw-white-1);
       margin-left: auto;
       margin-right: auto;
       @media(min-width: $screen-md) {