fix(DB/Quest): On Ruby Wings - prevent Antiok idle despawn pre-engage (#25785)

Co-authored-by: Claude Opus 4.7 <[email protected]>

data/sql/updates/pending_db_world/rev_1778350030492406400.sql

@@ -0,0 +1,6 @@
+-- Restore TEMPSUMMON_MANUAL_DESPAWN (8) with no timer for Thiassi -> Antiok
+-- accessory. With timer 0 this is rewritten to TEMPSUMMON_DEAD_DESPAWN at
+-- runtime, so Antiok only despawns when he dies and no longer ticks down
+-- while seated on Thiassi pre-engage.
+UPDATE `vehicle_template_accessory` SET `summontype` = 8, `summontimer` = 0
+    WHERE `entry` = 28018 AND `accessory_entry` = 28006;