chore: fix migration script for sqlite

Author: boojack

store/migration/sqlite/0.24/00__memo.sql

@@ -1,6 +1,7 @@
--- Drop deprecated tags column.
-ALTER TABLE memo DROP COLUMN tags;
-
 -- Remove deprecated indexes.
+DROP INDEX IF EXISTS idx_memo_tags;
 DROP INDEX IF EXISTS idx_memo_content;
-DROP INDEX IF EXISTS idx_memo_visibility;
+DROP INDEX IF EXISTS idx_memo_visibility;
+
+-- Drop deprecated tags column.
+ALTER TABLE memo DROP COLUMN tags;