filepicker: default Height of 0 causes view to break when traversing directories

**Describe the bug**
The [default Height of the filepicker is set to 0](https://github.com/charmbracelet/bubbles/blob/ff8b5a8e17c91972211d0b9f03e7764ddaa2f6d0/filepicker/filepicker.go#L40). When I go to the parent directory or go down a directory (i.e. press H or L), the view breaks. The `filepicker.View()` renders nothing, not even the "No files found".

Just `fp.SetHeight(1)` fixes it in my code, so I think it makes sense to have the Height set to 1 by default.

**Setup**
- Windows 11/WSL 2.4.12.0
- zsh 5.9
- Windows terminal
- No multiplexer