Update fourslash test

Author: ahejlsberg

tests/cases/fourslash/stringLiteralCompletionsForOpenEndedTemplateLiteralType.ts

@@ -1,6 +1,6 @@
 /// <reference path="fourslash.ts" />
 
-//// function conversionTest(groupName: | "downcast" | "dataDowncast" | "editingDowncast" | `${string & {}}Downcast`) {}
+//// function conversionTest(groupName: | "downcast" | "dataDowncast" | "editingDowncast" | `${string}Downcast` & {}) {}
 //// conversionTest("/**/");
 
 verify.completions({ marker: "", exact: ["downcast", "dataDowncast", "editingDowncast"] });