Bug 1559316 - ensure badge background does not turn white when tbody gets focus on :active. r=mtigley

Differential Revision: https://phabricator.services.mozilla.com/D35065

--HG--
extra : moz-landing-system : lando

devtools/client/accessibility/accessibility.css

@@ -418,7 +418,7 @@ body {
   -moz-outline-radius: 2px;
 }
 
-.treeTable:focus .treeRow.selected .badges .badge {
+.treeTable:focus-within .treeRow.selected .badges .badge {
   background-color: var(--badge-active-background-color);
   border-color: var(--accessible-active-border-color);
   color: var(--theme-selection-color);