Invalid CSS - 'display: hidden'

L75 in [src/useArrowContainer.ts](link: https://github.com/alexkatz/react-tiny-popover/blob/fecaaef1fbd61bbe0dd0b22be38635c57af6ceed/src/useArrowContainer.ts#L75
) is not valid CSS and likely a BUG or dead code.

Current:
```ts
   return {
                display: 'hidden',
              };
```

Expected:
```ts
   return {
                display: 'none',
              };

```