Bug 24786: (QA follow-up) Reset beenSubmitted on validation failure

When the form submision fails due to validation errors we need to also
reset the preventFormDoubleSubmit state to allow for a second submission
with corrected form fields.

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

koha-tmpl/intranet-tmpl/prog/en/modules/members/paycollect.tt

@@ -389,6 +389,12 @@
                         }
                     }
                     [% END %]
+                },
+                invalidHandler: function(event, validator) {
+                    // reset beenSubmitted for prevenDoubleFormSubmit
+                    event.target.beenSubmitted = false;
+                    // remove class added by preventDoubleFormSubmit
+                    $("body, form input[type='submit'], form button[type='submit'], form a").removeClass('waiting');
                 }
             });
         });