fix(DB/GO): changes the respawn time of Ammo Crate (#7447)

Decreases the respawn time of the Ammo Crate (entry: 176785, guid: 10663) from 900 s to 15 s.
The Ammo Crate doesn't despawn at all in Classic WoW, but in AC we need to wait til the old crate is despawned, before spawning a new one.

data/sql/updates/pending_db_world/rev_1629391445774422568.sql

@@ -0,0 +1,4 @@
+INSERT INTO `version_db_world` (`sql_rev`) VALUES ('1629391445774422568');
+
+-- Change the respawntime of the Ammo Crate to 15 s
+UPDATE `gameobject` SET `spawntimesecs` = 15 WHERE (`id` = 176785) AND (`guid` IN (10663));