Fix 659989af45: Set appropriate town window dirty when building/removing airports. #9497
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Motivation / Problem
When building or removing airports and airport noise setting is on, the invalidated town window is not right.
The noise generated by an airport is applied to the nearest town to the airport and not to the town associated to the station (see commit 659989a).
Description
Invalidate the town window where the noise is really applied to.