fix: remove unused formatBoolean import from migration 033

Removed unnecessary import that could cause issues if helpers.js
doesn't define formatBoolean. Migration already uses correct
boolean syntax without the helper.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

backend/migrations/033_add_gallery_feedback.js

@@ -1,4 +1,4 @@
-const { formatBoolean } = require('./helpers');
+// No helpers needed for boolean values
 
 exports.up = async function(knex) {
   console.log('Adding gallery feedback tables...');