Bug 1832766 - Do not use lexical variable in test_jsterm_autocomplete.html to avoid redeclaration error in verify mode. r=devtools-reviewers,nchevobbe

Differential Revision: https://phabricator.services.mozilla.com/D179171

devtools/shared/webconsole/test/chrome/test_jsterm_autocomplete.html

@@ -92,7 +92,7 @@
 
       window.varify = true;
 
-      const Cu_Sandbox = Cu ? Cu.Sandbox : null;
+      var Cu_Sandbox = Cu ? Cu.Sandbox : null;
     `;
     await evaluateExpression(state.webConsoleFront, script);