change form selector so it works on both save & save as (#4470)

src/pfwbged/collection/pfwbcollection.js

@@ -413,7 +413,7 @@ function select_metatype(elem)
     $('.save-as-widgets div').show();
     return false;
   });
-  $('form#pfwbsearchform').submit(function() {
+  $('#pfwbged-criterias').parents('form').submit(function() {
     /* enable select (with criteria type) just before submit, so their values
      * are sent to the server.
      */