Cancel a proposed or active bounty. All the funds will be sent to treasury and
the curator deposit will be unreserved if possible.

Only `T::RejectOrigin` is able to cancel a bounty.

- `bounty_id`: Bounty ID to cancel.

## Complexity
- O(1).

- There is a proposal called 266 that needs to be checked.
- It is important to read and understand the proposal.
- The proposal is on Polkassembly.
- It is a referendum.
- The details of the proposal are not mentioned in the given content.

#265 WRONG!! SEE THE PROPOSAL #266

No Active Proposals