[Bug]: Stray new lines added in project file when saving project

### What happened?

- Rivet unexpectedly adds stray new lines in the project file when saved through the application

### What was the expected functionality?

- Save functionality was affected

### Describe your environment

MacOS, Node 14.0.0, etc.

### Relevant log output

_No response_

### Relevant screenshots

_No response_

### Code of Conduct

- [X] I agree to follow this project's Code of Conduct

No source file or test is identified. Reproduce the problem by saving a project through the Rivet application on macOS, then inspect the saved project file to determine where the extra newlines are introduced. Done means saving no longer adds stray newlines and the project file retains its expected formatting.

Written by the indexing model from the issue text.