fix typo in .codesandbox/tasks.json

Author: Friz-zy

.codesandbox/tasks.json

@@ -32,6 +32,6 @@
  "clean-nginx-logs": {
  "name": "Clean nginx access and error logs",
  "command": "echo > /var/log/nginx/*.log"
- },
+ }
  }
 }