Commit message auto-wrap leaves trailing white-space

### Version

0.17.1

### Operating System

macOS

### Distribution Method

dmg (Mac OS - Apple Silicon)

### Describe the issue

As seen in e.g.

https://codereview.qt-project.org/c/qt/qtbase/+/688097/1//COMMIT_MSG

### How to reproduce (Optional)

_No response_

### Expected behavior (Optional)

_No response_

### Relevant log output (Optional)

```shell

```