Consider allowing `ROUSG::burn` to burn dust amounts
`ROUSG::burn` is used by admins to burn `rOUSG` tokens from any account for regulatory reasons.\\nIt does not allow burning a share amount smaller than 1e4, because this is less than a wei of `OUSG`.\\n```\\nif (ousgSharesAmount < OUSG_TO_ROUSG_SHARES_MULTIPLIER)\\n      revert UnwrapTooSmall();\\n```\\n\\nDepending on the current and future regulatory situation it could be necessary to always be able to burn all shares from users.
Consider allowing the `burn` function to `burn` all remaining shares even if under the minimum amount.
```\\nif (ousgSharesAmount < OUSG_TO_ROUSG_SHARES_MULTIPLIER)\\n      revert UnwrapTooSmall();\\n```\\n