chore: remove unncessary set and list operation

ibis/backends/__init__.py

@@ -76,7 +76,7 @@ def _gather_tables(self, database=None, like=None) -> list[str]:
             tables.extend(
                 self._execute_if_exists(method_name, database=database, like=like)
             )
-        return list(set(tables))
+        return tables
 
     def __call__(self, database=None, like=None):
         return self._gather_tables(database, like)