[Fix Bug] correct the sig_level's title.

resources/templates/plugin-schema.handlebars.json

       "key": "sig_level",
       "dataIndex": "sig_level",
       "valueType": "switch",
-      "title": "Cluster Ordered",
+      "title": "Significant Level",
       "tooltip": "Significant level, greater than 0 and less than 1.",
       "fieldProps": {
         "step": 0.01