Bug 1699590 - Resume page execution before ending browser_dbg-scopes-duplicated.js test. r=nchevobbe

This test doesn't explicitely resume page execution before ending,
so I imagine that the spawn task may still be pending as the test closes.

Differential Revision: https://phabricator.services.mozilla.com/D109293

devtools/client/debugger/test/mochitest/browser_dbg-scopes-duplicated.js

@@ -156,6 +156,8 @@ add_task(async function() {
   nodes = getAllLabels(dbg);
   ok(nodes.length > originalNodesCount, "the target node was expanded");
   ok(nodes.includes("classList"), "classList is displayed");
+
+  await resume(dbg);
 });
 
 function getAllLabels(dbg, withIndent = false) {