Fix untestable highlightRequired condition to use needsSevereImpact condition (#1295)

Author: howard-e

tests/resources/aria-at-test-run.mjs

@@ -1092,7 +1092,7 @@ export function userValidateState() {
           },
           untestable: {
             ...command.untestable,
-            highlightRequired: false,
+            highlightRequired: needsSevereImpact(command),
           },
           unexpected: {
             ...command.unexpected,