fix jsonthings compatibility (#1616)

Co-authored-by: YoungOnion <[email protected]>

src/main/java/com/gregtechceu/gtceu/common/CommonProxy.java

@@ -325,7 +325,7 @@ public void registerPackFinders(AddPackFindersEvent event) {
  event.getPackType(),
  Pack.Position.BOTTOM,
  GTDynamicResourcePack::new));
- } else {
+ } else if (event.getPackType() == PackType.SERVER_DATA) {
  // Clear old data
  GTDynamicDataPack.clearServer();