chore(Upload): fix test warning (#4375)

Removes the warning:
```
      Eufemia Icon required: A Tertiary Button requires an icon to be WCAG compliant in most cases, because variant tertiary has no underline.
      (Override this warning using icon={false}, or consider using one of the other variants) 
```

packages/dnb-eufemia/src/components/upload/UploadFileListCell.tsx

@@ -189,7 +189,7 @@ const UploadFileListCell = ({
     ) : (
       <div className="dnb-upload__file-cell__text-container">
         {onClick ? (
-          <Button variant="tertiary" onClick={onClick}>
+          <Button icon={false} variant="tertiary" onClick={onClick}>
             {file.name}
           </Button>
         ) : (

packages/dnb-eufemia/src/extensions/forms/Value/Upload/Upload.tsx

@@ -56,6 +56,7 @@ function Upload(props: Props) {
             {getIcon(file)}
             {onFileClick ? (
               <Button
+                icon={false}
                 size="small"
                 variant="tertiary"
                 className={classnames('dnb-upload__file-cell__title')}