Fix SiegeWar not respecting one of Towny's bankruptcy settings.

does_nation_tax_delete_conquered_towns_that_cannot_pay was not being
respected and bankrupt towns that couldn't pay the per-plot nation
occupation tax were being removed.

src/main/java/com/gmail/goosius/siegewar/TownOccupationController.java

@@ -144,8 +144,10 @@ private static double collectNationOccupationTax(Nation nation, double taxPerPlo
 			if (town.getAccount().getHoldingBalance() - tax < debtCap * -1) {
 				// The Town cannot afford to pay the nation occupation tax.
 				Messaging.sendGlobalMessage(Translatable.of("msg_occupation_tax_cannot_be_paid", town.getName()));
-				removeTownOccupation(town);
-				TownyUniverse.getInstance().getDataSource().removeTown(town, Cause.BANKRUPTCY);
+				if (TownySettings.doesNationTaxDeleteConqueredTownsWhichCannotPay()) {
+					removeTownOccupation(town);
+					TownyUniverse.getInstance().getDataSource().removeTown(town, Cause.BANKRUPTCY);
+				}
 				return 0;
 			}