ISTWCMS-4618: refix blue to black on details summary broken by 7c15f6c1

source/_patterns/04-components/details/_details.scss

@@ -21,7 +21,7 @@ $details-font-family: gesso-font-family(primary);
   margin: rem(gesso-spacing(md)) 0;
   transition: box-shadow gesso-duration(short) gesso-easing(ease-in-out);
   width:100%;
-  [open] > .seven-details__summary {
+  &[open] > .seven-details__summary {
     color: gesso-brand(org-default,uw-black,'primary');
   }
   &:hover {
@@ -40,6 +40,7 @@ $details-font-family: gesso-font-family(primary);
     display: none;
   }
 }
+
 .seven-details__summary,
 .details__summary {
   @include svg-background(mobile-arrow-down);