fix: inserting variables in reports

I noticed that recent changes broke inserting variables into reports. This PR fixes that.

libs/shared/lib/components/textEditor/plugins/InsertVariablesPlugin.tsx

@@ -36,7 +36,7 @@ export const InsertVariablesPlugin = () => {
     }
 
     return Object.entries(typeObj.attributes)
-      .map(([k, v]) => Object.keys(v).map((x) => `${k} ${x}`))
+      .map(([k, v]) => Object.keys(v.statistics).map((x) => `${k} ${x}`))
       .flat();
   }