Fix #12594: Give descriptive error when company takeover fails due to vehicle limit #12676
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Motivation / Problem
As per #12594, company takeovers that fail due to vehicle limit do not explain why beyond an error, "Can't buy company..."
Description
Clarify the reason with an existing error string and clarify the comment. Despite its broad name,
MayCompanyTakeOver()
only checks vehicle limits.Closes #12594.
Limitations
Does not strictly need backporting, but no languages are changed so I don't see a reason to exclude it.
Checklist for review
Some things are not automated, and forgotten often. This list is a reminder for the reviewers.