Fix permission check of `/as rent`, fix 'already bought' check of `/as buy`

AreaShop/src/main/java/me/wiefferink/areashop/regions/BuyRegion.java

@@ -297,6 +297,7 @@ public class BuyRegion extends GeneralRegion {
 			} else {
 				message(offlinePlayer, "buy-someoneElse");
 			}
+			return false;
 		}
 
 		boolean isResell = isInResellingMode();

AreaShop/src/main/java/me/wiefferink/areashop/regions/RentRegion.java

@@ -436,6 +436,7 @@ public class RentRegion extends GeneralRegion {
 		// Check if the player has permission
 		if(!plugin.hasPermission(offlinePlayer, "areashop.rent")) {
 			message(offlinePlayer, "rent-noPermission");
+			return false;
 		}
 
 		// Check location restrictions