Fix: Adjust scrolling interval of credits to account for text line height #8994
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Motivation / Problem
The credits in the "About OpenTTD" window scroll a fixed amount at a fixed interval.
The text is scrolled the same pixel distance, so with larger font sizes can take much longer than intended to scroll through the list.
Description
This patch adjusts the scrolling interval by the text line height, so the time to scroll the list becomes constant. This is done rather than scaling the pixel distance to maintain the appearance of smooth scrolling.
Limitations
Checklist for review
Some things are not automated, and forgotten often. This list is a reminder for the reviewers.