🐛 Bug: `sentences-per-line/one`: fixer incorrectly handles spaces between sentences

### Bug Report Checklist - [x] I have tried restarting my IDE and the issue persists. - [x] I have pulled the latest `main` branch of the repository. - [x] I have [searched for related issues](https://github.com/JoshuaKGoldberg/sentences-per-line/issues?q=is%3Aissue) and found none that matched my issue. ### Expected Thank you for creating this plugin - I find this concept improving Markdown readability. This source file ```md Foo. Bar. Baz. Foo2. Bar2. ``` gets transformed by the autofix on the entire file (after multiple tranformations) to ```md Foo. Bar. Baz . Foo2 . Bar2. ``` which breaks the sentences structure. Note also there's an extra space left only after the first sentence. ### Actual I expect the autofix to remove any extra spaces and to not break the sentences, i.e. transform the given input to: ```md Foo. Bar. Baz. Foo2. Bar2. ``` ### Additional Info _No response_