style: remove interaction with the user

[vil02]

Description of Change

It makes this file more CI-friendly (i.e. can help with #2753) - now it can be run without any user interaction. Similar to #3006.

Checklist

• Added description of change
• Added file name matches File name guidelines
• Added tests and example, test must pass
• Added documentation so that the program is self-explanatory and educational - Doxygen guidelines
• Relevant documentation/comments is changed or added
• PR title follows semantic commit guidelines
• Search previous suggestions before making a new one, as yours may be a duplicate.
• I acknowledge that all my contributions will be made under the project's license.

Notes:
Removes redundant std::cin.