Fixes warning about already existing file saving. (#2260)

Spigot JavaPlugin#saveResources either replaces or complains that replacement is disabled. So it is necessary to check if file does not exists before saving it.

Fixes #2259

src/main/java/world/bentobox/bentobox/BentoBox.java

@@ -1,5 +1,7 @@
 package world.bentobox.bentobox;
 
+import java.nio.file.Files;
+import java.nio.file.Path;
 import java.util.List;
 import java.util.Optional;
 
@@ -464,9 +466,16 @@ public boolean loadSettings() {
             return false;
         }
 
-        log("Saving default panels...");
-        this.saveResource("panels/island_creation_panel.yml", false);
-        this.saveResource("panels/language_panel.yml", false);
+        if (!Files.exists(Path.of(this.getDataFolder().getPath(), "panels", "island_creation_panel.yml"))) {
+            log("Saving default island_creation_panel...");
+            this.saveResource("panels/island_creation_panel.yml", false);
+        }
+
+        if (!Files.exists(Path.of(this.getDataFolder().getPath(), "panels", "language_panel.yml"))) {
+            log("Saving default language_panel...");
+            this.saveResource("panels/language_panel.yml", false);
+        }
+
         return true;
     }