Core/Datastores: corrected db structure for item.db hotfix table and removed timestamp field from hotfix_data as the timestamp is being generated by the server

sql/updates/hotfixes/4.3.4/2020_02_22_00_hotfixes.sql

@@ -0,0 +1,6 @@
+ALTER TABLE `hotfix_data`   
+  DROP COLUMN `Timestamp`, 
+  DROP PRIMARY KEY,
+  ADD PRIMARY KEY (`TableHash`, `RecordID`);
+
+ALTER TABLE `hotfixes`.`item` ADD COLUMN `DisplayInfoID` INT(10) UNSIGNED DEFAULT 0 NOT NULL AFTER `Material`;