Fix params.txt saving for infotexts modified by process_batch

[space-nuko]

Describe what this pull request is trying to achieve.

If something in a process_batch callback modifies the infotext, the changes will not be reflected in params.txt, so they will not be restored if it's recalled later. So I made params.txt be written as late as possible, after all script callbacks have finished running.

Additional notes and description of your changes

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Environment this was tested in

List the environment you have developed / tested this on. As per the contributing page, changes should be able to work on Windows out of the box.

• OS: Windows
• Browser: Chrome
• Graphics card: NVIDIA RTX 3090

Screenshots or videos of your changes

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