First commit weirdness

[flippette]

Describe the bug

Using gitui to make the first commit in a repository doesn't work, and somehow changes the active branch to master (this is not init.defaultbranch either, mine is set to main)

To Reproduce

Steps to reproduce the behavior:

1. Create a blank repository
2. Make a commit
3. Observe that it didn't commit anything
4. Open the Branches menu
5. The active branch has changed to master
6. git branch by now lists only the master branch, but it's not active

Expected behavior

The commit should have succeeded, and the active branch should not have been changed.

Screenshots

Here's an asciinema replay:

https://asciinema.org/a/K8Cu0yDaRTbjROPn9SCwRM6LD

Context (please complete the following information):

According to gitui --bugreport (env vars and command line omitted):

#### Software version

gitui 0.27.0

#### Operating system

- OS: Linux (Fedora Linux 42)
- Kernel: 6.15.8-200.fc42.x86_64

#### Compile time information

- Profile: release
- Target triple: x86_64-unknown-linux-gnu
- Family: unix
- OS: linux
- Architecture: x86_64
- Pointer width: 64
- Endian: little
- CPU features: fxsr,sse,sse2,x87
- Host: x86_64-unknown-linux-gnu

Additional context Add any other context about the problem here.