fix: Append .conf to config files during saving if they don't end with it

serverpackcreator-api/src/main/kotlin/de/griefed/serverpackcreator/api/config/PackConfig.kt

@@ -476,7 +476,12 @@ open class PackConfig() {
         conf.setComment(pluginsKey, pluginsComment)
         conf.set<Any>(pluginsKey, plugins)
 
-        TomlFormat.instance().createWriter().write(conf, destination, WritingMode.REPLACE, StandardCharsets.UTF_8)
+        val confFile = if (!destination.name.endsWith(".conf")) {
+            File( "${destination.absolutePath}.conf")
+        } else {
+            destination
+        }
+        TomlFormat.instance().createWriter().write(conf, confFile, WritingMode.REPLACE, StandardCharsets.UTF_8)
         log.debug("Saved config to ${destination.absolutePath}")
         return this
     }