Fix memory leak in TimetableSnapshot related to patternsForStop#7253

VillePihlava wants to merge 2 commits intoopentripplanner:dev-2.xopentripplanner/OpenTripPlanner:dev-2.xfrom

HSLdevcom:clear-patterns-for-stopHSLdevcom/OpenTripPlanner:clear-patterns-for-stopCopy head branch name to clipboard