fix(DB/Loot): corrects the drop rate of Winterfall Firewater (#8016)

* fix(DB/Loot): corrects the drop rate of Winterfall Firewater

- Closes #7920

* Update rev_1632235858441614200.sql

data/sql/updates/pending_db_world/rev_1632235858441614200.sql

@@ -0,0 +1,19 @@
+INSERT INTO `version_db_world` (`sql_rev`) VALUES ('1632235858441614200');
+
+UPDATE 
+	`creature_loot_template` 
+SET 
+	`Chance` = 
+	(CASE 
+		WHEN `Entry` = 7438 THEN 7
+		WHEN `Entry` = 7439 THEN 7
+		WHEN `Entry` = 7440 THEN 8
+		WHEN `Entry` = 7441 THEN 8
+		WHEN `Entry` = 7442 THEN 8
+		WHEN `Entry` = 10199 THEN 7
+		WHEN `Entry` = 10916 THEN 6
+	END)
+WHERE
+	`Item` = 12820
+AND
+	`Entry` IN (7438, 7439, 7440, 7441, 7442, 10199, 10916);