cmd/gf: gen pb changes currect working

### Go version

/

### GoFrame version

/

### Can this bug be reproduced with the latest release?

Option Yes

### What did you do?

gf gen pb 会更改当前工作路径，导致一些意外的情况出现

### What did you see happen?

例如导致单测失败
https://github.com/gogf/gf/actions/runs/11513842473/job/32051852646

### What did you expect to see?

gf gen pb 后回到当前路径