Fixed out of memory errors when copying AT states.

src/main/java/org/qortal/repository/hsqldb/HSQLDBDatabasePruning.java

@@ -153,6 +153,7 @@ public class HSQLDBDatabasePruning {
                                 }
                             }
                         }
+                        repository.saveChanges();
 
                     } while (latestAtStatesResultSet.next());
                 }
@@ -161,8 +162,6 @@ public class HSQLDBDatabasePruning {
             }
         }
 
-        repository.saveChanges();
-
 
         // Finally, drop the original table and rename
         LOGGER.info("Deleting old AT states...");