Question: Cashout limit limits

We have limits on the limits the lead can set, so spefically

```Rust
pub const MinimumCashoutAllowedLimit
pub const MaximumCashoutAllowedLimit
```

constrain what lead can do in `update_channel_payouts` to update the _actual limts_ in storage

```Rust
pub MaxCashoutAllowed get(fn max_cashout_allowed) config(): BalanceOf;
pub MinCashoutAllowed get(fn min_cashout_allowed) config(): BalanceOf;
```

do we really need this? This was perhaps even an audit finding, not sure :D

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