fix: notifications tables drop order (#3186)

Since `user_notifications` references `notifications`, it makes sense to
drop `user_notifications` before dropping `notifications` and not the
other way around. This should fix the failing tests on Enterprise with
latest main.

Thanks @gastonfournier for the help finding the bug 👍

src/migrations/20230222154915-create-notiications-table.js

@@ -25,8 +25,9 @@ exports.up = function (db, cb) {
 exports.down = function (db, cb) {
     db.runSql(
         `
+        DROP TABLE IF EXISTS user_notifications;
         DROP TABLE IF EXISTS notifications;
-        DROP TABLE IF EXISTS user_notifications;`,
+        `,
         cb,
     );
 };