A small fix in `delete_hive_post` SQL function

hive/db/sql_scripts/hive_post_operations.sql

@@ -133,9 +133,11 @@ BEGIN
   UPDATE hive_posts
   SET counter_deleted =
   (
-    SELECT max( counter_deleted ) + 1
-    FROM hive_posts
-    WHERE id = __post_id
+      SELECT max( hps.counter_deleted ) + 1
+      FROM hive_posts hps
+      INNER JOIN hive_accounts ha ON hps.author_id = ha.id
+      INNER JOIN hive_permlink_data hpd ON hps.permlink_id = hpd.id
+      WHERE ha.name = _author AND hpd.permlink = _permlink
   )
   ,block_num = _block_num
   WHERE id = __post_id;