Load all item data types before migrating Extra fields on schema update

https://forums.zotero.org/discussion/82153/beta-startup-error

chrome/content/zotero/xpcom/schema.js

@@ -629,7 +629,7 @@ Zotero.Schema = new function(){
 		}
 		
 		var items = await Zotero.Items.getAsync(itemIDs);
-		await Zotero.Items.loadDataTypes(items, ['itemData', 'creator']);
+		await Zotero.Items.loadDataTypes(items);
 		for (let item of items) {
 			let changed = item.migrateExtraFields();
 			if (!changed) continue;