fix(db): the operation of putting byte[0] should be reserved instead of deleting

Author: tomatoishealthy

framework/src/main/java/org/tron/tool/litefullnode/LiteFullNodeTool.java

@@ -232,7 +232,6 @@ private void recover(DBInterface db, String destDir, List<String> destDbs)
           if (realValue != null) {
             destDb.put(realKey, realValue);
           } else {
-            destDb.delete(realKey);
             byte op = value[0];
             if (Value.Operator.DELETE.getValue() == op) {
               destDb.delete(realKey);