Update demo page's metadata

frontend/pages/demo/named-entity-recognition/index.vue

@@ -122,7 +122,7 @@ export default {
             document: 8
           }
         ],
-        meta: '{"wikiPageId":2}',
+        meta: { wikiPageId: 2 },
         annotation_approver: null
       }
     }

frontend/pages/demo/sentiment-analysis/index.vue

@@ -71,7 +71,7 @@ export default {
             document: 8
           }
         ],
-        meta: '{"wikiPageId":2}',
+        meta: { wikiPageId: 2},
         annotation_approver: null
       }
     }

frontend/pages/demo/text-to-sql/index.vue

@@ -51,7 +51,17 @@ export default {
             document: 8
           }
         ],
-        meta: '{"department.department_id": "INT", "department.name": "CHAR", "department.num_employee": "INT", "head.head_id": "INT", "head.name": "INT", "head.age": "INT", "management.department_id": "INT", "management.head_id": "INT", "management.temporary_acting": "VARCHAR"}',
+        meta: {
+          "department.department_id": "INT",
+          "department.name": "CHAR",
+          "department.num_employee": "INT",
+          "head.head_id": "INT",
+          "head.name": "INT",
+          "head.age": "INT",
+          "management.department_id": "INT",
+          "management.head_id": "INT",
+          "management.temporary_acting": "VARCHAR"
+        },
         annotation_approver: null
       }
     }

frontend/pages/demo/translation/index.vue

@@ -57,7 +57,7 @@ export default {
             document: 8
           }
         ],
-        meta: '{"wikiPageId":2}',
+        meta: { wikiPageId: 2},
         annotation_approver: null
       }
     }