Remove trailing whitespaces in settingsUsed.txt

During one of our tests, we noticed that the generated file `settingsUsed.txt` uses an excessive amount of trailing whitespaces in each line.

Start by locating the code that generates settingsUsed.txt and reproduce the reported output in the relevant test or generation flow. Check each generated line for trailing whitespace; done means the file is still generated correctly without excessive trailing spaces.

Written by the indexing model from the issue text.