fix(@feflow/cli): 修复开发套件命令注册错误

[xqxian]

用户使用 .feflowrc 注册项目命令时，例如：

{
  "projectCmd": {
    "builder" : "feflow-devkit-demo:devkitCmd"
  }
}

应读取 feflow-devkit-demo 下
devkit.json 中 devkitCmd 对应的配置，而不是 projectCmd 的

[tencent-adm]

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