Limit dropdown types

assets/javascripts/discourse/components/wizard-custom-field.js.es6

@@ -64,8 +64,7 @@ export default Component.extend({
     
     if (this.isDropdown) {
       options.wizardFieldSelection = 'key,value';
-      options.listSelection += ',assignment';
-      options.inputTypes = 'association,assignment';
+      options.inputTypes = 'association';
       options.pairConnector = 'association';
       options.keyPlaceholder = 'admin.wizard.key';
       options.valuePlaceholder = 'admin.wizard.value';