FIX: fix legacy integer id generation (don't increment by two)

src/main/java/org/caosdb/server/entity/LegacyIds.java

@@ -60,7 +60,6 @@ public class LegacyIds extends EntityIdRegistryStrategy {
     if (!isInit) {
       init();
     }
-    ++currentMaxId;
     return Integer.toString(++currentMaxId);
   }