Fixed ConcurrentModificationException when loading populations with u…

…nselected plans

contribs/application/src/main/java/org/matsim/application/prepare/scenario/CreateScenarioCutOut.java

@@ -572,9 +572,7 @@ public void run(Person person) {
 		}
 
 		// Remove all unselected plans because these are not handled
-		person.getPlans().stream()
-			.filter(p -> p != person.getSelectedPlan())
-			.forEach(person::removePlan);
+		person.getPlans().removeIf(p -> p != person.getSelectedPlan());
 	}