Fix minor box shadow issue with recordfinder clear button (#1231)

Author: Quendi6

modules/backend/formwidgets/recordfinder/partials/_recordfinder.php

@@ -25,7 +25,7 @@ class="field-recordfinder loading-indicator-container size-input-text"
         <?php if ($value): ?>
             <button
                 type="button"
-                class="btn clear-record"
+                class="btn btn-default clear-record"
                 data-request="<?= $this->getEventHandler('onClearRecord') ?>"
                 data-request-confirm="<?= e(trans('backend::lang.form.action_confirm')) ?>"
                 data-request-success="var $locker = $('#<?= $field->getId() ?>'); $locker.val(''); $locker.trigger('change')"