uniweb: Fix captcha form responsibility

uniweb/templates/uniweb/uniweb_form_page.html

@@ -60,7 +60,7 @@
               </div>
             {% elif field.widget_type == "captchatext" %}
               <label class="form-field__label" for="{{ field.id_for_label }}">{{ field.label }}</label>
-              <div class="form-field__wrapper form-field__wrapper--shadowed w-1/2">
+              <div class="form-field__wrapper form-field__wrapper--shadowed sm:w-1/2">
                 {{ field|add_class:"text-input form-field__control" }}
               </div>
             {% else %}