DB/SAI: Fix two wrong action_types that would make the creature cast the Death Touch spell on no target (SMART_TARGET_NONE) instead of move to given target_x/y/z/o co-ordinates.

The person who wrote this script accidently used action_type 11 (SMART_ACTION_CAST) instead of 69 (SMART_ACTION_MOVE_TO_POS), and since the action_param1 field of SMART_ACTION_MOVE_TO_POS is the motion id (point id given back to SMART_EVENT_MOVEMENTINFORM), it was set to 5. Ironically, the first parameter of SMART_ACTION_CAST is the spell id and it was spell id 5 is Death Touch.
However this script would do nothing because I changed it so that SMART_TARGET_NONE no longer functioned as SMART_TARGET_ACTION_INVOKER in this commit: 9653576cb4. Before this commit, though, it WOULD cast Death Touch. Fun fun fun.

sql/updates/world/2013_12_17_00_world_sai.sql

@@ -0,0 +1 @@
+UPDATE `smart_scripts` SET `action_type`=69 WHERE `entryorguid`=137300 AND `id` IN (19,20);