fix key name

Author: wackerow

src/data/quizzes/index.ts

@@ -35,7 +35,7 @@ const quizzes: RawQuizzes = {
     title: "page-assets-merge",
     questions: ["h001", "h002", "h003", "h004", "h005"],
   },
-  solo-staking: {
+  "solo-staking": {
     title: "solo-staking",
     questions: ["j001", "j002", "j004", "j005", "j006", "j007", "j008"],
   },