Fix memory leaking in ShopLoader

src/main/java/org/maxgamer/quickshop/database/DatabaseHelper.java

@@ -198,6 +198,7 @@ public class DatabaseHelper {
     }
 
     public void removeShop(Shop shop) {
+        plugin.getShopLoader().removeShopFromShopLoader(shop);
         plugin.log("[DATABASE HELPER] Removing shop in the database: " + shop.toString());
         if (plugin.getConfig().getBoolean("debug.shop-deletion")) {
             for (StackTraceElement stackTraceElement : new Exception().getStackTrace()) {

src/main/java/org/maxgamer/quickshop/shop/ContainerShop.java

@@ -426,6 +426,7 @@ public class ContainerShop implements Shop {
             }
             plugin.getShopManager().removeShop(this);
             plugin.getDatabaseHelper().removeShop(this);
+            plugin.getShopLoader().removeShopFromShopLoader(this);
         }
         // Use that copy we saved earlier (which is now deleted) to refresh it's now alone neighbor
         if (neighbor != null) {

src/main/java/org/maxgamer/quickshop/shop/ShopLoader.java

@@ -330,6 +330,23 @@ public class ShopLoader {
         return new ArrayList<>(shopsInDatabase);
     }
 
+    public void removeShopFromShopLoader(Shop shop) {
+        if (this.shopsInDatabase.remove(shop)) {
+            for (ShopDatabaseInfoOrigin origin : this.originShopsInDatabase) {
+                if (Objects.equals(shop.getLocation().getWorld().getName(), origin.getWorld())) {
+                    if (shop.getLocation().getBlockX() == origin.getX()) {
+                        if (shop.getLocation().getBlockY() == origin.getY()) {
+                            if (shop.getLocation().getBlockZ() == origin.getZ()) {
+                                this.originShopsInDatabase.remove(origin);
+                                break;
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+
     @NotNull
     public List<ShopDatabaseInfoOrigin> getOriginShopsInDatabase() {
         return new ArrayList<>(originShopsInDatabase);