Fix #8349: Close depot vehicle list windows when closing the depot window #8717
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Motivation / Problem
#8349 - the depot vehicle list window did not close with the "parent" depot window, like it does for stations & waypoints
Description
Close the window alone with the depot window.
Limitations
None.
Checklist for review
Some things are not automated, and forgotten often. This list is a reminder for the reviewers.