fix(mkpkglists): only check against cache if we're using mysql

MySQL InnoDB offers the AUTO_INCREMENT column inside of
information_schema.tables, but SQLite does not.

For production, we always use MySQL.

Signed-off-by: Kevin Morris <kevr@0cost.org>

aurweb/scripts/mkpkglists.py

@@ -15,6 +15,9 @@ userfile = aurweb.config.get('mkpkglists', 'userfile')
 
 
 def should_update(tablename: str) -> int:
+    if aurweb.config.get("database", "backend") != "mysql":
+        return True
+
     conn = aurweb.db.Connection()
 
     db_name = aurweb.config.get("database", "name")