Fix can not modify required filelist input before starting (#14825)

web/app/components/base/file-uploader/store.tsx

   onChange?: (files: FileEntity[]) => void,
 ) => {
   return create<Shape>(set => ({
-    files: [...value],
+    files: value ? [...value] : [],
     setFiles: (files) => {
       set({ files })
       onChange?.(files)