route /api/table/table_name: Add explicit end event to end of stream

....othehrwise the browser will continue attempting to reconnect :-/

src/lib/agent/subsystems/http/routes/table.mjs

@@ -12,6 +12,6 @@ export default async function(sys, ctx, _next) {
 			table: next.table
 		});
 	}
-	
+	stream.write_json(`end`, {});
 	stream.end();
 }