Handle if the final NSP filepath already exists

nton/main.py

@@ -228,6 +228,9 @@ def build(
             return 2
 
         nsp_final_path = Directories.output / f"{name} by {publisher} [{id_}].nsp"
+        if nsp_final_path.exists():
+            log.warning("An NSP forwarder of the same name, publisher and title ID already existed.")
+            nsp_final_path.unlink()
         (Directories.output / f"{id_}.nsp").rename(nsp_final_path)
 
         log.info(f"Done! The NSP has been saved to {nsp_final_path}")