Fix for dropping unique constraint (#89)

Co-authored-by: Josip Milotić <[email protected]>

Author: josip-milotic

migrations/2023_03_29_095342_drop_unique_index_from_custom_fields_table.php

@@ -14,7 +14,7 @@
     public function up()
     {
         Schema::table('custom_fields', function (Blueprint $table) {
-            $table->dropIndex('cf_name');
+            $table->dropUnique('cf_name');
         });
     }