🐛 Fix parser field visibility on importer edit form

The form initialization check was previously only looking for new forms
(#new_importer), causing the JavaScript field visibility logic to be
skipped entirely on edit pages. This meant parser-specific fields weren't
being properly hidden/shown when editing existing importers.

Added .edit_importer to the form check to ensure the field visibility
logic runs on both new and edit forms.

app/assets/javascripts/bulkrax/importers.js.erb

@@ -2,7 +2,7 @@
 // All this logic will automatically be available in application.js.
 
 function prepBulkrax(event) {
-  if($('form#new_importer').length < 1) {
+  if($('form#new_importer, form.edit_importer').length < 1) {
     return true;
   }