Fix FreezeListener again

Signed-off-by: yoyosource <yoyosource@nidido.de>

BauSystem_Main/src/de/steamwar/bausystem/features/region/FreezeListener.java

@@ -108,4 +108,11 @@ public class FreezeListener implements Listener {
             event.getBlock().setType(Material.AIR, false);
         }
     }
+
+    @EventHandler
+    public void onFluidLevelChange(FluidLevelChangeEvent e) {
+        if (Region.getRegion(e.getBlock().getLocation()).get(Flag.FREEZE) == FreezeMode.ACTIVE) {
+            e.setCancelled(true);
+        }
+    }
 }