Core/SmartAI: Updated SMART_ACTION_RESPAWN_TARGET, should work for GOs as intented. Param1 is to set GO respawn time.

src/server/game/AI/SmartScripts/SmartScriptMgr.h

@@ -857,6 +857,11 @@ struct SmartAction
             uint32 withEmote;
         } flee;
 
+        struct
+        {
+            uint32 GoRespawnTime;
+        } RespawnTarget;
+
         struct
         {
             uint32 param1;