ISTWCMS-6110: Adds faculty org-stp to the -light array for mark

src/patterns/01-core/elements/_inline-elements.scss

@@ -127,15 +127,10 @@
       :where(mark) {
         background: var(--#{$colour}-2);
       }
-    } @else if $faculty == org-stj or $faculty == org-ren {
+    } @else if $faculty == org-stj or $faculty == org-ren or $faculty == org-stp{
       :where(mark) {
         background: var(--#{$colour}-light);
       }
-    } @else if $faculty == org-stp {
-      :where(mark) {
-        // For accessible AAA, fraction light than -light.
-        background: #65b4dc;
-      }
     } @else {
       :where(mark) {
         background: var(--#{$colour}-1);