Bug 1687788 - add fail-if condition on a11y_checks for browser_accessibility_relation_navigation.js. r=jmaher

Differential Revision: https://phabricator.services.mozilla.com/D102472

devtools/client/accessibility/test/browser/browser.ini

@@ -23,6 +23,7 @@ skip-if = (os == 'win' && processor == 'aarch64') # bug 1533534
 skip-if = webrender # bug 1674060
 [browser_accessibility_print_to_json.js]
 [browser_accessibility_relation_navigation.js]
+fail-if = a11y_checks # bug 1687788 select accessible object button is not accessible
 [browser_accessibility_reload.js]
 [browser_accessibility_sidebar_checks.js]
 [browser_accessibility_sidebar_dom_nodes.js]