Remove duplicate interface implementation

`BooleanFormField` already implements `ICssClassFormField`.

diff --git a/wcfsetup/install/files/lib/system/form/builder/field/CheckboxFormField.class.php b/wcfsetup/install/files/lib/system/form/builder/field/CheckboxFormField.class.php
index d72b610707ce3b7cd440e3c47b1bcf71e50d71c8..495577b3f4c8771e63404cdcc55922fbd5d45524 100644 (file)
--- a/wcfsetup/install/files/lib/system/form/builder/field/CheckboxFormField.class.php
+++ b/wcfsetup/install/files/lib/system/form/builder/field/CheckboxFormField.class.php
@@ -11,9 +11,7 @@ use wcf\system\WCF;
  * @package    WoltLabSuite\Core\System\Form\Builder\Field
  * @since      5.3
  */
-class CheckboxFormField extends BooleanFormField implements ICssClassFormField {
-       use TCssClassFormField;
-       
+class CheckboxFormField extends BooleanFormField {
        /**
         * @inheritDoc
         */