fix(DB): Defendo-tank 66D - fix target of "say" action (#1819)

- The Defendo-tank 66D talks on aggro, but uses "SMART_TARGET_ACTION_INVOKER" instead of "SMART_TARGET_SELF". This is corrected through this PR.

data/sql/updates/pending_db_world/rev_1557489332825322207.sql

@@ -0,0 +1,3 @@
+INSERT INTO `version_db_world` (`sql_rev`) VALUES ('1557489332825322207');
+
+UPDATE `smart_scripts` SET `target_type` = 1 WHERE `entryorguid` = 25758 AND `source_type` = 0 AND `id` = 0;