When using the backupFileExtension option, if the backup file exists,
the activation process fails. This adds an option to instead overwrite
the old backup instead of failing.
Render each bullet as a single line at runtime while keeping ~80-column source formatting. Prevents truncation of the colliding path in service logs, reducing the need to inspect journal output.
Before:
> Existing file '' would be clobbered by backing up '/home/winter/.config/fish/config.fish'
After:
> Existing file '/home/winter/.config/fish/config.fish' would be clobbered
