Make sure accordion-btn-focus-box-shadow gets applied to open accordion_panel()s (#489)

* Close #488. Make sure accordion-btn-focus-box-shadow gets applied to open accordion_panel()s

* Resave distributed files (GitHub Action)

* Resave data (GitHub Action)

---------

Co-authored-by: cpsievert <cpsievert@users.noreply.github.com>

Author: cpsievert

R/sysdata.rda

@@ -8,5 +8,12 @@
   }
   .accordion-button:not(.collapsed) {
     box-shadow: $accordion-box-shadow-active;
+    // $accordion-box-shadow-active defaults to none, which will override
+    // the box-shadow applied to .accordion-button:focus (and, as a result,
+    // non-collapsed buttons won't show a visual indication of focus, #488).
+    // So, repeat the .accordion-button:focus below to give it a higher priority.
+    &:focus {
+      box-shadow: var(--#{$prefix}accordion-btn-focus-box-shadow);
+    }
   }
 }