Update Wafflebot default issue labels

[robin-rpr]

1. Is your feature request related to a problem? Please describe. (这个功能是为解决什么问题) Wafflebot doesn't apply default labels to new Issues.

2. Describe the solution you'd like(请描述你期望的结果) Activate Wafflebot default label feature for brookshi/Hitchhiker.

3. Additional context (补充信息) Apply default issue labels as described here: https://docs.google.com/presentation/d/1tVMjEfuwcRa2x4XK6WsDj9GSph5jR7zJZzd1-61yeF4/edit?usp=sharing