Reset form submission before showing errors

showErrors appears to throw an exception unless DOM elements matching
the error are present, keeping formSubmitted from being reset to false

public/campaign-form.js

@@ -73,8 +73,8 @@ const postScriptLoad = function () {
               if (typeof errors.error !== 'undefined')
                 form.parents('.campaign-form').find('.alert-danger').removeClass('hidden')
               // show errors from rails
-              campaignForms[formId].validator.showErrors(errors)
               campaignForms[formId].formSubmitted = false
+              campaignForms[formId].validator.showErrors(errors)
             }
           })
         }