fix(CropperModal): beforeUpload should return false (#3601)

src/components/Cropper/src/CropperModal.vue

@@ -152,7 +152,7 @@
   function handleBeforeUpload(file: File) {
     if (props.size && file.size > 1024 * 1024 * props.size) {
       emit('uploadError', { msg: t('component.cropper.imageTooBig') });
-      return;
+      return false;
     }
     const reader = new FileReader();
     reader.readAsDataURL(file);