Make sure to create temporary files in the same directory as the result

src/main/kotlin/net/deliciousreya/minecraftportal/model/PortalDataStore.kt

@@ -158,8 +158,8 @@ class PortalDataStore (val logger: Logger) {
 
     fun onAfterChanged() {
         val destination = saveDataTo ?: return
-        logger.info("Saving updated data to $saveDataTo...")
-        val tempDestination = File.createTempFile("PortalSaveData", ".tmp.binproto")
+        logger.info("Saving updated data to $destination...")
+        val tempDestination = File.createTempFile(destination.nameWithoutExtension, ".tmp.binproto", destination.parentFile)
         val backupDestination = useBackup
         if (backupDestination != null && destination.exists()) {
             backupDestination.delete()