When open multiple worktree, using `file_finder` to create a new file
shoud respect current focused worktree.
test case:
```
project:
worktree A
file1
worktree B
file2 <- focused
```
when focused `file2`, `ctrl-p` toggle `file_finder` to create `file3`
should exists in worktreeB.
I try add test case for `CreateNew` in file_finder, but found not
worked, if you help me, I can try add this test case.
Release Notes:
- Fixed file finder selecting wrong worktree when creating a file
630a326a07