refactor: remove commented code in ListDatabasesTool for cleaner implementation

Author: tsck

src/tools/mongodb/metadata/listDatabases.tsx

@@ -40,7 +40,6 @@ export class ListDatabasesTool extends MongoDBToolBase {
                 htmlString: this.getUI() || "",
             },
             encoding: "text",
-            // The MCP client will automatically extract this and pass it to the iframe via postMessage
             uiMetadata: {
                 "initial-render-data": {
                     databases: uiDatabases,