Improve ThreadPanel ctx menu accessibility (#7217)

test/components/structures/__snapshots__/ThreadPanel-test.tsx.snap

@@ -46,21 +46,21 @@ exports[`ThreadPanel Header expect that My filter for ThreadPanelHeader properly
 
 exports[`ThreadPanel Header expect that ThreadPanelHeader has the correct option selected in the context menu 1`] = `
 <AccessibleButton
-  aria-selected={true}
+  aria-checked={true}
   className="mx_ThreadPanel_Header_FilterOptionItem"
   element="div"
   onClick={[Function]}
-  role="button"
-  tabIndex={0}
+  role="menuitemradio"
+  tabIndex={-1}
 >
   <div
-    aria-selected={true}
+    aria-checked={true}
     className="mx_AccessibleButton mx_ThreadPanel_Header_FilterOptionItem"
     onClick={[Function]}
     onKeyDown={[Function]}
     onKeyUp={[Function]}
-    role="button"
-    tabIndex={0}
+    role="menuitemradio"
+    tabIndex={-1}
   >
     <span>
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