Fix #9020: Update station coverage highlight when adding/removing tiles #9825
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Motivation / Problem
See #9020.
Description
Marks catchment area tiles dirty whenever tiles are added or removed from a station.
I'd previously created a PR (#9793) to fix this bug and closed it after getting stuck and frustrated. After force-pushing my new commit to the branch, it wouldn't let me reopen the old PR.
Closes #9020.
Limitations
Checklist for review
Some things are not automated, and forgotten often. This list is a reminder for the reviewers.